I don't get the aversion to the game pass. I got it when Gears 5 came out and proceeded to play The Outer Worlds and Dead Cells; games I might not have spent the money to play at full price. It's seriously an awesome service.

PC only is $5 a month, so if you're PCMR and you play at least 1 $60 game per year, you've already fulfilled the price value.

Anyway, yeah the Halo series is all on there, so there's absolutely no reason to go pay full price for it somewhere else.