Ladies who swallow also tend to be the ones who keep sucking and licking for a minute or two after I cum which is to me far more pleasurable. I don't care if they spit or swallow as long as they keep going for a while after I pop.
For the ladies who don't want cim, I would suggest using Skyn elite condoms. It makes a cbj feel like a bbbj and they have no issue with the extended bj at the finish.
For me, if it is a gf then yes more of a requirement, with an SP no, but it feels great when it happens.