I think it depends. Hihats seem to be the exception, producers have these and record them, very few program hihats. Those that don't have hihats, use prerecorded loops of real hihats. From what I have seen there are many drum recordings, but they tend to be single tracked, spliced and edited. Microphones are expensive. Acoustic bass/toms tends to be difficult to work with.Heard any new music lately (last 15-20 years)? Most of the drum sounds have been sound replaced. It's a fairly common practice now from what I've heard.