Even this is wrong. M-tickets were being sold on ScotRail routes for a while by trainline, even though ScotRail claimed that they didn't accept them because they couldn't read them. Several people were charged again and had to be refunded.E-tickets (new type) are only issued for journeys on which the TOC has a means to check them - not every journey. This rather backs up the premise you reject, doesn't it?
Same thing with ScotRail smartcards on CrossCountry. Tickets are sold at the same price and terms online on paper and on Smartcard and now on e-tickets. Some companies can't decide those terms don't apply because they dislike the ticket format - that's their problem.