That goes many places in an attempt to justify enjoying an authoritarian power fantasy, but ok.

I mean, my very nerdy answer is I don’t want to, I just don’t get a choice. I actively did not play Space Marines when I was playing the board game and they are by far the most boring faction, even if the minis look great. I am endlessly frustrated by their elevation as the default POV characters of the entire setting and miss the good old days when 40K at least pretended to be about PvP competition and had an incentive to keep a facade of supporting multiple sellable, playable factions.