I suppose so, but then again if you're travelling from a station that only has one TVM (as I normally do) you are taking a bit of a risk if you don't collect the tickets until immediately before travel.
A bit of a risk is an understatement, if the railway lets you down by cancelling services you have to jump through hoops and often pay money and wait weeks for them to refund you. If the railway lets you down by not providing a working ticket machine you are at risk of an argument and an attempt of prosecution.
Where do you draw the line? Trains can be cancelled at the very last minute after all the passengers are waiting on the platform, or indeed it isn’t unheard of for a train to be cancelled for whatever reason after the passengers have already boarded and are waiting for it to depart.
Or it may be terminated short or a connecting train cancelled after you’ve started your journey forcing you to return to your origin before claiming a refund.
My only paper ticket refund with LNER was a few years ago, I had collected, I had started a journey and abandoned it after an hour or so due to weather related problems making it impossible (and pointless) carrying on.
I applied for a refund by email and included a photo of the tickets (4 of, both portions of super off peak returns for 2 people). The tickets were whole, not marked in any way. They refunded in full within a couple of weeks or so.
It’s possible that they were focussing on getting through a lot of claims due to the major disruption so not getting hung up on technicalities.