Hello.....
Apple II
Apple IIe
Apple IIc
Apple only got where they are by betraying their fans.
When the Mac was released there was no backwards compatibility and support for their existing lines basically came to a screeching halt.
You do realise every ][series run the same speed processor and the whole system was designed with the timing of that processor in mind. So much so that the ][gs in many ways had a whole new system and a little toggle to throttle back the processor to the same speed as the older ][ series so programs would work (not just games either).
The ][ were great machines of their age but lets not gloss over it was their own design that stuck them in the past.