Macrocosmos does need a hard cap IMO of 30-50% regardless I believe it will be getting nerfed simply because of the precedent of SE nerfing skills/abilities that invalidate mechanics in current content.

They nerfed AoE Esuna because it would invalidate a mechanic in TEA and they especially 'nerfed' crit adlo because of how it had a reputation for removing multiple mechanics.

It might not be today, it might not be tomorrow, it might not even be in the coming year but it will get nerfed.

The fact it was allowed to exist in its current state is simply an oversight on the design team like usual. They didn't think about it too deeply. Same reason Pneuma got ninja nerfed on Endwalkers release to be dps neutral so it wouldn't end up Assize 2.0