If the FCC hadn't been so strict I think there's a good chance we'd be using computers with a lineage going back to Atari versus IBM today.
Commodore ate Atari's lunch with the C64 and pricing, but Atari could have launched the 400/800 at lower price points with more lax emission standards. They would have had lower peripheral price points, too, since the SIO bus and "smart peripheral" design was also an emissions strategy.
On the home computer front the Atari 8-bits beat the pants off of the PET for graphics and sound capabilities. More success in the late 70s might have enabled Atari to build down to a price point that would have prevented the C64 from even happening.
On the business side Atari R&D had interesting stuff going on (a Unix workstation, Transputer machines). Alan Kay even worked there! They were thinking about business computing. If the 8-bits had had more success I think more interesting future products could have been brought to market on the revenue they generated.