The price caps are but it's a bit of a pain if you forget to touch out somewhere or have to use national rail etc.
Plus sometimes it does actually go wrong. I have to request about 2-3 refunds a year where I've done the same route and not forgotten a thing.
>But at the same time you need to be able to digest the numerous rules around it like daily and weekly caps etc.
The price caps are quite easy to understand - you just tap your card when you travel and you'll always be charged the lowest applicable fare. You don't have to think about whether you need to buy a daily or weekly ticket, because you'll never be charged more than the daily or weekly fare cap.