A few questions about Armored Core 6

Is this one of those games that will automatically upgrade from the PS4 to PS5 version?

Are there any significant missing features in the PS4 version compared to the PS5 version?

For people who've played the game on PC, do PC input methods (mouse/keyboard, flightstick, etc.) improve the experience of this game (if they're supported at all) or do you still play it mainly with a gamepad?