Call me old-fashioned but, if I'm writing, I might start with a ballpark tempo but my ear will tell me quickly enough whether I'm on the mark, or not. (That said, I've been working with drum machines for almost 3 decades.) One thing to consider is that a given rhythm can be mapped in different ways across beats and bars... mind you, there's usually a way that makes the best sense... but it's proportional, how you count it out across the measures.
Too me it all depends. Many times a track at 140 moves as if it were at 70. Some tracks at 100 have a heavy energy due to packing 16th and 32nd notes with bass or heavy percussion. It could feel like 200.
BPMs are only a small part of a tracks energy.