Yet again, this is a thread where I am left wondering why, if etickets are so hard to use, I regularly sits in trains where ticket inspections are happening and hear a string of beeps as 95% of passengers are using them?
Yeah, same. They have really taken off because to the general population they are more convenient.
They made it really easy for me to commute for around four or five of the ten years I took the train to work. I can count on one hand the difficulties I had by e.g. buying a single journey the wrong way round because of being dozy while using the app and paying a sort of 'stupid tax' for the mistake and so on. (I didn't have many more issues with paper tickets but it does help me to streamline things -- as neurologically challenged I need all the help I can get!)
I currently travel for work a few times a month. I have my own work phone, but I can send emailed tickets to my own smartphone no problem. I do have to ensure I click the e-ticket option on our website that defaults to TOD, but after that it's plain sailing.
For phone battery issues, buy a cable and maybe a plug charger or battery pack. Most trains have sockets on them; I carry them anyway because of wanting to charge my phone at work, a hotel or my parents' place or generally at home. Battery packs are useful for me because I do several events a year when I will be using my phone to connect to a card reader but won't have access to a fixed mains socket, so I'm not just buying charging accessories to use e-tickets -- they are really useful in so many different modern situations that most people will have them already and carry them while out.
London is an exception but I've generally got round that by buying an e-ticket to a terminal then using contactless onward. I haven't yet had to cross London to get anywhere (Reading is brilliant as a junction for a lot of different lines and so even going to some more exotic locations I can avoid London altogether) but as someone I dearly love says, 'I'll fall off that bridge when I come to it'.
The only reason to get paper tickets is still PlusBus but even that is only a marginal saving over the main bus system day ticket I buy for. Once they integrate that into e-tickets I'll be laughing.
Honestly, e-tickets are a complete godsend Just like my work's paperless office, it's an absolute game-changer for this autistic person who drowns under a mass of clutter if given the chance. Mind you, I am one of those people who would have her phone implanted in her wrist if given half the chance, so that's my perspective as to what makes things easier, but the general consensus out there on the actual railway seems to be on my side rather than OP's.