>>54298999I doubt they'll divert Archaludon from a successful niche. There is a decent few mons that do switch HA but i can't recall them off the top of my head, generally that relates to "useless" abilities though.
Stalwart is very good for doubles, and SV certainly didn't try to hurt redirection.
Its non-hiddens are already pretty well rounded too. They had more reason to remove defiant from Kingambit and they didn't do it there either.
Logically the only reason is to not completely nuke the base form, which considering Duraludon has proven itself a failure even with incredibly good backing; I don't think GF would particularly care.