Not everyone has seen Persona 3. It was a late cycle PS2 game at a time when people were more interested in different types of games. Remaking it allows a team to take a different approach and re-present it for a modern audience.
For Persona 3 specifically, it is a relatively safe development project because there is a script and structure to follow and a proven demand for it. If you want money to go to more interesting projects, that money has to come from somewhere. By releasing P3make, Atlus will sell X million units and got a big fat Game Pass deal. That money doesn’t sit in a Scrooge McDuck pile, it goes to games like Unicorn Overlord (where the profits are much smaller) and that new RPG I can never remember the name of which is taking years to make. Just releasing the PS2 version on PS5 would not generate as much money and Atlus would suffer from shareholders who want more Persona games out there.
Expecting to get Blur on the PS5 with a £10 upgrade is, if I may be blunt, a nonsense. All games from different eras were written on dramatically different systems and porting them is often a large effort. That effort needs to be paid for and a £10 dollar upgrade to port a PS3 game to PS5 just isn’t going to cut it.
I am glad that more and more games are getting remasters or ports as it makes them more available to more people. I also think the remakes that do something different with the source material are excellent. The Resi 2 remake reimagines whole swathes of the game and stands as a different take/companion piece to the original.
Also, remakes are a good way to safely test a concept before applying it to a new game. You have an existing structure to tinker with and apply new ideas to without having to sell players on a whole new thing. They also exist to train up newer staff members in a relatively safe space.
Games cost 10s and 100s of millions of dollars to make. If you want the new stuff, remakes, remasters and ports are things that help pay for that.
I agree that more classics should be readily accessible and things like the selection of PS1 and PSP games on PS5 are ridiculously poor. However, the rumoured new PS2 emulator for PS5 gives me hope that Sony may be righting the retro ship as it were.
I understand the frustrations you are venting but it isn’t realistic and remakes, remasters and ports have a lot of value for players and help fund lots of cool games (and if you want more interesting games, platforms are actually full of them).
Edit - must say though that 1:1 remakes with “”“better”“” graphics like Demons Souls and SOTC miss the point of the original completely and to my tastes, somewhat worthless.