From a purely practical point of view the change to there being multiple different forms of ticket presentation is a pain in the ar*e.
Before : Come down train checking tickets. People present card ticket. I visually inspect with my eyes, which takes a second or two, stamp if necessary and continue to the next person. Occasionally someone won't see me coming and they have to fumble around looking for it. Most passengers kept railcards with tickets as all railcards were station issued and in ticket wallets so both were presented at the same time.
Now : Come down train checking tickets. Some people present card ticket, I check and stamp as before. Some people have paper Star Mobile tickets. IN the case of return tickets they are often screwed up and tatty making reading more time consuming. If an open return ticket our instruction is to scan them too. This means I have to get out my company phone, wake the screen up, open the scanning app, scan, and put phone away. They don't often scan once folded or screwed up so that doesn't always work. The next few passengers have card tickets so back to the old process. Someone has a railcard, but because it is an online issued plastic one they don't have a ticket wallet, so it is in their purse / wallet with about 5000 other discount / store / loyalty cards, so they have to fumble around looking for it. The next person has a phone ticket. But they are currently looking at Facebook so they have to close that app, move their screen around to find the ticket app, then open the ticket app, then find their ticket wallet, then find the ticket for the journey today. They often show the Outward leg rather than the return because they don't realise there are two bits. They often don't activate it because they don't read the instructions. I have to get my scanner out again. Then I ask to see their railcard, so repeat the fumbling around process above. The next person has a print at home ticket, but their printer was running out of ink, or the settings weren't right, so parts of the printing are missing or illegible. The scanner might not scan it because of that. Some people shrink it down which makes reading difficult and scanning often impossible. The next few people have traditional tickets - phew. The next person has brought a ticket on their app, but they selected to collect it at the station. They have a reference number, but have not collected their ticket because they didn't realise they needed to because they hadn't actually read what they were doing when they brought the ticket. I can see it is an Anytime ticket, so could be used by anyone or refunded, so I then enter a long debate about why they need to pay again. The next few people have normal tickets - phew again. The next person has a mobile phone ticket, but it is a screenshot, rather than the ticket itself, because their friend brought it for them. I can't scan it because the friend sent the ticket picture rather than the aztec code. Enter debate about why they need to pay again. Then someone has a flat battery, which is never their fault, and they ask if I have a charger they can use. Then we have some more people with traditional paper tickets, which is a relief, although even this is tiresome as there now seem to be about 50 different layouts and print formats, rather than 2 or 3. Then some more mobile tickets, all correctly downloaded and ready, but I need to get the scanner out again for each one, and scanning each one and the scanner app focusing and doing it's business takes more time than a visual check and stamping by hand. Then someone has an MCard, but they don't have the paper counterpart because the paypoint retailer never gave it to them. So I have to open my phone again, open a different app, which is painfully slow to open and work, then scan the card, then wait for the app to do something.
If you then start adding in the need for someone to switch apps to show the railcard, or wake their phone up to show their railcard when they have a paper ticket and yet more time is wasted.
And then lots of people wonder why they never see the Guard in their part of the train!
And don't get me started on ticket gates when people start fumbling around with their phones, bits of paper, print outs etc, and then trying to work out what to do or where the scanner is as every gate is different.
At least with card tickets it was easy and every gate is the same.
Now I am not against the advance of new technology etc, but it really ought to be co-ordinated better, because at the minute it is a complete shambles. There are so many different apps, all presenting things differently, and doing different things, and so so many people really don't read what they are buying or what they need to do when asked to show the ticket and then start asking for help in what to do etc. Oh, and then they realise they haven't downloaded their ticket to their app yet, but they have no data, and the train has no wifi, or they have no signal, but it's never their fault for not reading what to do. At least with a paper ticket everyone knew where they stood and what to do.
Add in railcard apps too and more time is wasted, more confusion and fumbling around takes place and there is yet more potential for problems.
Rant over.