West Midlands trains had TV in some carriages, annoying and unnecessary........
Oh my yes, I remember those, annoying is right! Same for the TVs on Heathrow Express, they weren't terribly useful on the 332s and I can't be sure now (it was late evening after a flight, and all I wanted to do was get to the hotel) whether or not the 387s had them when I finally got on a HeX 387 in March.
They're still there on Voyagers -- the little control panel and headphone socket between the two seats!
Those things generate a nice bit of nostalgia for me, I used to use them quite often when on a Voyager ride. It might not have been for long, but it was helpful on the days when I didn't have any AA batteries with charge in them. Without those, my CD player was a bit useless!
WiFi on trains, quite honestly I don't bother. I remembered it should be available on a 172 I was on yesterday, but I didn't bother and just used 4G. I get 16GB a month of data and I rarely use even a quarter of that. It was 12GB, but when I had to restart a rolling bundle on Three PAYG it had gone to 16GB. Not bad value for £10, fair play to that. I'd be happy with paying less for just 5GB as that's all I want, but I'll take that bundle for £10, in this day and age that's not bad.
On-train entertainment systems, I've tried a few of them now. Me and Chiltern WiFi don't get on no matter what I try, GWR's WiFi occasionally worked and I don't bother with either. Once upon a time it was great WiFi on TfW, but they introduced restrictions on it and it just made sense to stop using it. I'd rather the power sockets worked properly on trains, which in my experience is not too common sadly.
LNWR and its Loop system, when it lets me into it can be OK but to be honest, more often than not, even on a Birmingham to London journey, I'm on my mobile data and doing other stuff. Quite honestly, I forget it is even a thing!
National Express and that Vuer system, I think I made it work once, or I did for a brief time then it gave up on me. On a coach where I was one of the only few people on it, so it wasn't as if it was overloaded! All other modern day systems I don't bother with at all, never tried Beam on the West Coast, not even slightly interested in the trial system that LNER are doing (it's ITV, oh my no, I'd rather take my TV or other device to a recycling centre) and I suspect most people are the same. I spend way too much looking at screens these days, so the time spent doing almost anything else is seriously welcome.
Now if the TOCs focused on providing working power sockets, that would be a worthwhile investment. Too many times I've been on a train without a working socket, it's not really acceptable in the modern day to have non-working sockets!