For me, it all comes down to that roster spot.... dedicating one roster spot to a full time DH who has largely been in decline at the one job he has over the past few months is a headache for anyone tasked with building a roster for 2023, there's really no other way to slice it.
Who knows, maybe Miggy will see a renaissance next year in his final season, but somehow I doubt it. And his presence takes away one additional spot that could be filled externally or internally. It is what it is, but it sucks regardless.