The Apple II provided the ability to connect to your TV (as opposed to purchasing a dedicated monitor). However, at that time, the FCC criterion for applying stringent RF emission limits was 'device that connects to your TV' (as opposed to in the eighties when it changed to 'device that is marketed to consumers'), and Apple was unable to comply with those limits, so they dodged the regulation by encouraging another company to supply the RF modulator: https://en.wikipedia.org/wiki/Sup%27R%27Mod
Why was Apple unable to comply with the limits when e.g. Atari managed it? To some extent it was simply a matter of difficult engineering, but I have also seen it suggested that the expansion slots were the spoiler. I can understand how this might be so, given that the case had openings in the back through which cables could run to expansion cards. Later, the IBM PC solved the problem by covering all such openings with metal slats.
Was that the problem, and could the Apple II have solved it that way? Or was it a more fundamental problem of being unable to guarantee emissions compliance with every possible expansion card? Which way did the FCC see it?