It really depends. Setting aside taste (some guys really are unpleasant tasting, but not most of them) - if your guy runs less hot than you, a blowjob to completion means one less opportunity to do something for both of you. So it can feel like: oh getting all turned on by it, then it’s over and you are left hanging for days while he generates enough sex drive to have sex again. That was the issue with my ex, who was a once a week guy. Husband now, we are pretty equal and it’s not a big deal. If I do this one morning, after work we can still fuck.

Mostly agree with you on it being a fun thing to do though, you are right about that. It’s not a chore or a drag, just sometimes frustrating.