pros and cons, will depend on the type of thing a team/company is working on. I've been on the receiving end of this with some negative experiences as well.

Team1: "Hey, we've launched a new initiative a few weeks back. Important for us to be able to add one field to the response of your internal billing API. Can we discuss what that would take?"

Team2: "Hey, probably a few hours of work. But, we just had our quarterly planning last week. In 12 weeks you can submit for Q2, and _maybe_ we will plan it somewhere in May or June."