That 90% probably also includes computer games. I'm not sure whether those need fast main memory. They certainly need fast VRAM.
Most games do not, unless you want the best graphics. But then you’re out of the 90% use cases
DDR4 have similar latency as DDR5 and that's what matters in all games, while raw bandwidth only matters in some games
Most games do not, unless you want the best graphics. But then you’re out of the 90% use cases