Borderlands 4's producers have claimed that Borderlands 4 has "more skills per character than in Borderlands 3 and 2 added together."
It's hard to believe it's been that long since Borderlands 3, but somehow that game is over five years old at this point (it'll be a day before six years when it launches on September 12, 2025), it's even a few months older than Death Stranding, which really puts it into perspective (I mean sure, there was Tiny Tina's Wonderlands in the middle there, but c'mon). From the way Gearbox tells it, that time was put to good use, as the character classes in Borderlands 4 seem way more in-depth this time around.
