I'm a huge opponent of native abilities. Most of them don't bring anything of value to the metagame, so it's just deciding to arbitarily be inconsistent because we what, really want poison heal gliscor? Some of them are actively cancerous, too; Magnet Pull should never see the light of day (imagine trying to face down the likes of roaring moon or even meowscarada when corv goes from a check to liability with one uturn) and GAG gholdengo is a real "run tusk or get fucked" moment. Arena Trap and Shadow Tag are just innately uncompetitive and should especially stay the fuck out.
Could not agree more with this post. Restrictions are an inconsistent headache that do nothing but muddy the waters of the tier for, at best, minimum benefit and at worst active detriment. AAA, on a theoretical level, works under the assumption that all Pokemon take a "magic ability change item" (or whatever you want to call it) that gives them access to every ability, except the banned ones. For a Pokemon like Chien-Pao that uses its native ability, it doesn't just not have the item used on it, it instead selects Sword of Ruin as an option after the taking it. That is the (conceptual) point of Almost Any Ability and how it works, at least in my and most other people's eyes. Adding restrictions only serves to muddy this idea and make it inconsistent.
Theoretically, all that the proposed ability description does is make it so that some Pokemon arbitrarily don't have to have the magic ability changed item on them... for what reason? Metagame benefits and negatives aside, how does this at all improve on the core idea of Almost Any Ability to justify the restriction? For a metagame like Godly Gift, the restriction system serves to give the tier its own identity and control over its own tiering decisions, for example. It's a direct improvement on the concept of Godly Gift. I fail to see how this improves the core concept of AAA. It's not a bad idea, and the tier would still be functionally playable, but on a deeper level, this is a wholly unnecessary bordering on negative change.
Also, before I close out this post, let me reiterate on what's already been said: Ability Trapping is hugely uncompetitive, and if this tier wants to retain any level of serious-ity, it should be kept far away.