Understood, but are you able to elaborate on what bad experience(s) you had with an e-ticket?
I'm pretty sure I'm in general agreement with you that e-tickets are OK, that they're going to be even better when more widely used, and that m-tickets (or "e-tickets" which are really m-tickets) are bad.
Be that as it may, your original poll didn't ask people to vote based on their bad experiences.
However I'm happy to admit that I haven't had any bad experiences with an e-ticket, primarily because I have been fastidious in their use, only using them when I knew they were likely to be accepted without problem. Informed by many posts on this forum. To date I've only used them for Wilmslow-London Virgin/Avanti journeys. However I've commented recently in this thread that I'm about to take the plunge and use them with Northern/TPE. A year ago I'd have had more reservations and expected to run into problems, but I think next month I'll probably be OK. So things are moving on and improving. I certainly observe (from the bar above the ticket line at Manchester Piccadilly) how many people now use and presumable expect to use tickets on mobile devices.