but don't hold back progress on our multi-GHz NG machines
You talk about progress, but are happy to be stuck with AmigaOS derivative operating systems. If you want progress, use a peecee with a modern operating system.
If you like Amiga land, then you've got to accept that you're always going to lag FAR behind what's available now, and it's most likely NOT going to change. Doesn't matter to me. I use an A1200 and a peecee (yeah, with Winblows). Best of both worlds.
Also, why should 68k developers who enjoy 68k cater to NG users?
for the sake of a 20 year-old machine.
Those old machines are what it's all about to many people, including myself (no nostalgia).