Until your phone battery dies and your stranded far from home 
Was on 5% Wednesday before I was safely back at my car in Blackpool.
Those damn illuminations and camera usage 
No use having a 24hr BPL mobile ticket if can’t show it to the guard.
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Was happy to find could use e tickets between Basingstoke and reading as the tickets for last time are incompatible’
TFL will open them up on request (if you ask nicely)
The barcode tickets don’t always work -even on the right service and there is always the issue of the phone dying but less of problem now lots of trains have either a socket or USB.
I only used them in a previous role as the client paid for site travel - I could either pay myself and reclaim (they were very slow with expenses) or they would pay directly for and e-mail me the e-tickets. Pretty much a no brainer really.
You are right, in fact all stations without a QR code reader do operate in this way.
If you have a valid ticket, and can’t scan it, you can just ask an attendant to open the gate for you. I’ve never really had an issue doing that at National Rail stations but I wouldn’t really want to do it on the Underground as there aren’t so many attendants around on that.
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