I couldn't get through Halo 4's campaign when it was released as part of the MCC, nor was I able to get though Halo Infinite's (it wasn't bad, just... meh; nowhere near as good as the Bungie campaigns but not trash either, just not as good). I would still like the option to play Halo 5 on PC just so I have the ability to play the main campaign, plus I've heard it's the best multiplayer Halo? But yeah. Even if I never actually play it, it's nice to have the option.

On a tangential note, I think 343's Halo games would have been considered good if it wasn't for Bungie's Halo. I don't think their campaigns are honestly bad, per se (though again, haven't tried to play H5), they're just bad in comparison to the "OG" games.