no no no shut up we get that remakes are dime a dozen these days but unlike most other games Persona 3 actually deserves it, quite a lot too
Persona 3 Portable and Persona 3 FES are both games with different amounts of upsides and downsides, Persona 3 Portable has a female protagonist campaign (that alters the dialogue quite radically mind you) but it also cuts back on most of the FMVs and 3d environments are completely exclusive to dungeons. The game plays more like a visual novel with RPG elements than an actual RPG game
Persona 3 FES has the full experience in terms of presentation, all environments are fully modeled and FMVs are there and readily available. It lacks the female protagonist campaign however and to make it even worse you can't control your party members in combat. The game overall is much much worse from a playability standpoint.
Not to mention that in comparison to P4 and P5 persona 3 is overall just a more left out, forgotten game. Whether it's because of the other 2 being more recent or the actual merits of Persona 3 I have no idea, but a Remake would bring that game back into the limelight
A remake that combines both of these games strengths while leaving out the flaws is the best option and if you thought before you typed, you'd probably be on board with the idea.