I agree and that's the whole philosophy behind the ClassicWB! Luckily ClassicWB has very few patches running as that's always been my aim, compatibility, far less extra patches than any other package. Compatibility is near perfect in comparison to a standard install (and I only say near in case some clever clogs proves me wrong) plus it dual boots (via mouse buttons) into a workbench without ANY extra software for testing purposes.
That's why I was surprised you had MCP running in your HDF - that is a huge patch isn't it? Or is it required for something?
Rest assured, classicwb is very clean in it's operation.