Dunno, I have the same objections I've had when this has popped up in other threads before!I find it strange that we had a thread not long ago where people were suggesting pretty much exactly what is proposed, with the one issue raised as being the issue of purchase a long way in advance*, and now the railway is proposing to actually do pretty much exactly what was suggested on here people are now up in arms about it as some kind of overreach or surveillance?
The issue I find with buying the Railcard post-dated in order to secure an Advance fare is the logistics of changing the Railcard start date if you later decide to buy another Advance on an earlier date.
Let's say today is 18th March, and I buy an Advance with post-dated Railcard for 1st June. That all seems sensible enough. Now let's say my friend asks if I want to meet up on 1st April, is this system going to be able to change the 1st June start date of my Railcard to 1st April for this new ticket?
Then we think ok that's not too difficult to program, tickets being sold 12 weeks in advance in most cases. But what about say the Caledonian Sleeper service, which can be booked a whole year in advance? If I book a ticket with a new Railcard to travel in March 2027 then book this 1st April trip, by the time my CS trip comes around I'm going to have days left on my Railcard, which technically isn't a problem but may trip some people up. What then if, in a month's time, I change my CS booking to be April 2027, because they have fee-free amendments? Presumably the booking software is going to need to be reprogrammed to account for Railcard expiry dates when amending bookings as well as when making and paying for the initial booking.
None of it is technically difficult but I think, like most things to do with Railcards, it just adds an unnecessary barrier.
I still advocate for ditching most Railcards entirely, but keeping the discount, so to get the 16-25 discount you should show your ID which shows yours 16-25 for example.