@[email protected] IMO, the distinction is probably that the artwork was made to look good on a CRT with colors being manifested into existence by some side effects of the beam and its analog nature. It's not really because "shittier is better", just that the sprites objectively look worse without it.
Meanwhile, sound being poor because the TV speakers were garbage is a different proposition, I'd think. As long as the sound chips are properly recreated, sound isn't made worse in the process.