With the impending release of P5, the guilt of never finishing P4G is beginning to creep up on me. I know many people here said it being on handheld was the only reason they were able to finish it, but for me it allowed me to push it to the side for newer console games so often I have not touched it in at least a year, so I will probably start over.
But my fear is that if I give in and choose to not play P5 until I finish P4G, by the time I finish P4G I will have some Persona fatigue and not have a desire to play 5 for the foreseeable future; or if I play 5 first, I will not want to go back to play 4.
It all lines up perfectly as my backlog is slimming (Nier Automata, Hitman Episodes 4-6, Attack on Titan), with only Yooka Laylee potentially grabbing my interest until at least the FFXII remake.
I beat P4G before going back and playing P3 FES and it didn't make either game less enjoyable. The lack of direct control in combat was definitely missed, but playing them out of order didn't make P3 FES any less fun. If you really want to play P5, I'd play it now instead of playing Golden and 5 back to back. Persona fatigue is totally a thing, if only because of how long each game can be. By the end of 3 I never wanted to see Tartarus ever again.
Or, wait for P5R or whatever name they'll use for the handheld version of the game that will come out on the next Sony handheld in about five years. That'll give you some time to finish Golden.