JP's said he's getting a lot of heat for that and is apparently relaying it to the relevant people, who knows if it'll change. But as it is, being able to choose to fight only the bosses will make the game 20x better.
None of the bosses are fun to fight, though.
Mistral = stupid bombs in the way
Monsoon = no comment needed
Sundowner = stupid fucking helicopter
President = no comment needed
Sam = dies in 2 hits with a parry, uninteresting fight