Yeah i see your point, it appears they didn't do much remarkable compared to Halo. creatively speaking
Platinum Games was formed because they wanted to do their own creative thing in the industry separated from Capcom, they struggle sometimes and say what you want of them but they are doing their best releasing games Capcom just wouldn't aprove
Monolithsoft started as a team from Square Enix who felt managment favored too much Final Fantasy and wasn't willing to give other things a chance, so they went to work with other companies.
Igarashi and team just wanted to make more Castlevania for the fans, but Konami wouldn't support them for some reason, then eventually released Bloodstained.
Kojima Productions is obvious
there are others idk but while Bungie hasn't exactly reached the prestige of Halo, their formula was succesful and they are making lots of money though
or Maybe Microsoft just were terrible employers