I still really hope a physical card is available after the trial period. I know supposedly "everyone has smartphones" these days, but I would expect occasions where the app crashes or doesn't work leaving people without valid tickets. The physical card is just easier to use. There are presumably accessibility issues by having it restricted to digital-only too. It's going to be more of a faff switching between different apps if you've bought mobile tickets and have a digital railcard in a separate app as well.
(I forget my phone/have it run out of battery more often than forgetting a railcard, FWIW)
(I forget my phone/have it run out of battery more often than forgetting a railcard, FWIW)