It would be cool but also I dont want it an excuse for some games to not make it into the library
I agree. Adding trophies takes a considerable amount of resources. Some publishers might not want to invest the time and money to do this..
People wanted them to get rid of trophies when they did it for PS2 games on PS4.
I don't think anyone wanted Sony to "get rid" of trophies for PS2 games on PS4. They just wanted Sony to make trophy support
optional. Let the publisher decide whether they want to put in the extra work, rather than having Sony force it on them. That's the reason why companies like Electronic Arts and Ubisoft never made any PS2 games available on PS4, while they approved
multiple original Xbox games for Xbox One.
Has everyone forgotten the PlayStation Classic at this point? Not expecting much for the legacy titles based on that fiasco.
That was a much more limited product, that didn't have the ability for users to add their own games (well, not
officially).
Digital downloads for contemporary hardware are a whole other ballgame. If there's an opportunity for publishers of old PS1 and PS2 games to make easy money off of those games, then they'll likely jump on it...as long as they aren't forced to rejigger their games with unnecessary developmental hassles.