In which case a Mac Plus, SE & Classic would have been unable to use later software which required an FPU ... would software FPU emulators run on a 68000?

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SANE - Standard Apple Numeric Environment

The first mac to use an FPU was the MacII, the first 68030 to not require one was the IIsi. Then there was the whole crippled 680LC40 thing.

68000s can't use many things including FPUs, virtual memory, anything past 7.5.5 etc.

The one thing they do have is preemptive threading with ThreadsLib.