The psone games have not aged well, the games of nes and snes have a nostalgic aura. Psmini is not a good emulator, nes and snes mini is a good emulator and brings the feel of the classic 8 and 16 bit era. Finally, the arcade games that reflect on the NES and SNES games have a nostalgia factor that much of the Psone library does not share.
i don’t think you can blame the poor aging of ps1 titles on the failure of the psmini. it’s pretty clear that those who wanted a psmini were not impressed with the game selection, and that sony didn’t try very hard to make sure the game selection was optimal. the result really is on sony who thought the mini could sell itself and the game selection didn’t matter too much.