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on a game that was developed on a multiplatform engine from the start.
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Key sentence. The Halo collection is a port of games from old hardware, and there are big problems that come with that. They've said that there's a fully playable PC game there, so they either have one big problem with a certain hardware set or they're piss-fiddling with little details to make every scene run smoothly across the board. If they have to have hundreds of little hacks to make each scene run well on all hardware, then I really feel sorry for them, but they have a lot to make up with their PC reputation.
Anecdotal, but my favorite story of a port is Kingdom Hearts from PS2 to PS3. They lost all of the original data, so they had to basically recreate everything from the final retail version. Given the drastically different hardware, that probably meant recoding the entire engine. All of the graphics were redone from scratch. It was completely spot on, to the point where nobody could have known that it wasn't just copy+pasted with new graphics. Considering the differences between the PS2 and PS3, remaking it was probably a big part of the reason it was so good.