SO WHEN DOES THIS GET HARDER THAN PERSONA 4? BECAUSE SO FAR, IT'S MUCH EASIER.
Only the last two major bosses are hard. The real difficulty aside from that comes from the Tartarus bosses. If you're playing on Hard you need to use specific tricks for a lot of them, on Normal they're mostly no big deal. I think the next really problematic one you'll fight is Sleeping Table.