“the game had the medieval Final Fantasy VI style”
Well FFVI was a lot more steampunk than medieval with its second industrial revolution setting. In fact it laid the groundwork that FFVII & FVIII would follow. It’s more accurate to say FFIX’s medieval style called back to FFI-FFV’s style.
“the most refined version of Final Fantasy’s turn-based combat”
“it’s the highest point of the franchise’s turn-based combat approach”
FFX-2 undoubtedly has the best incarnation of the ATB in the entire series.
“Final Fantasy IX was a game lost to many due to it releasing in a period of transition between the PS1 and PS2.”
It wasn’t that overlooked, far from it. FFIX still stands as one of the highest selling PS1 games. The 15th best selling game on that platform to be exact.