I have a Macintosh Plus, SE, 7200, and iMac G3 (System 6, 6, 7, 9) I've been using for fun lately after fixing many of them up. Even with real SCSI harddrives in the SE, 7200, and iMac, they're such a joy to use compared to a modern OS. Often much more responsive, UI is always more consistent, not to mention better aesthetics. They really don't make software like they used to. A web browser or OS should not be slow on any modern hardware but here we are.
System 7 runs so fast in BasiliskII on an old Atom netbook. I recently saw a video showing System 6 running in an emulator on an ESP32 microcontroller on an expansion card in an Apple II. It was substantially faster than the Mac Plus it was emulating. It really takes seeing this kind of thing to understand the magnitude of the problem.
