There's multiple communities where people post pics / youtubers who print minis in FDM if you want to look at the results, and while the quality isn't perfect it is more than good enough and is way better than the old pewter minis we used to deal with.
Look at these
Tyranid or
Custodes armies and if you honestly think that they're not good enough to be playable, then you're legitimately insane.
Sure resin will be better if you want to churn out whole armies to play in one hit or you need maximum quality that nobody will notice unless they're right up in your face, but unless you're looking to print farm/sell stuff, FDM is fast/good enough to keep you busy (depending on the model & your print settings, 3-8 hours per 32mm model).