Why is bebop's default build spirit/tank but gunbop prevails?

They changed his sticky bomb recently to increase debuff resist and continuously nerfed his gun damage and increased sticky bomb damage. yet top level players always go gunbop. in my experience this just seems to be the most optimal way to play him as well unfortunately although i find spirit bebop more fun. hybrid seems eh as well. im curious why they seem so against gun doorman and paige, nerfing them into the ground yet don't seem to do the same for bebop despite them seeming to want him to a spirit/tank type character?