Should I rebuy PERSONA 5 on steam?

There's a sale on P5 royal for steam, but the issue is I have already purchased in on XBOX/microsoft store a long time ago (when it was still on gamepass). There would be no reason for me to purchase it again, other than a few bonuses (mod compatability, etc)

I've never rebought a game from a different launcher before even if it's on a good sale (feels like a waste). If I don't get p5, I plan on getting re2 or another game for the summer sale. But for some reason everytime I look at the sale, I get this urge of buying it. (Usually I have good self control, but not so much on this one)

If you guys don't mind, could you give reasons on why YOU wouldn't/would purchase it? So I can determine if I should buy this game, again

Thanks ;D