True but watts cost money. My SDS only goes to 900 rpm and that wasn't enough for the wood jobs I come across (router bits in a lock morticing jig). A high watt percussion drill (2500 loaded rpm) was a revelation.
I'm out of the loop on SDS (had to look it up) but router bits in a drill seem like a fairly specialized application to me.
Some of the prices for those drills are astounding.
High rpms alone do not a good drill make.
The ability to maintain whatever the machine is rated for under load and over time makes a good one.