Lower-power CPU's rising to the occasion to crowd out high end chips is a recurring theme in the industry, but especially for Apple! 620 never got anywhere because the 604 variants were better and then the 603-based 750 (G3) was a lot better. G5 never got anywhere because not the Pentium4, but the Celeron-derived CoreDuo was a lot better! Now abandoning Intel because iPad ARM CPUs are a lot better!
The 603’s were horrible. With the slower cache and I believe they had less cache memory, the 68K emulator crawled. Back then, most of the OS itself was still emulated.
