By "common chip sizes", I mean they're common to CM (ChipMixer). For Non-CM transactions, chip sizes are not common at all. That's why what they say in their FAQ won't work. CM actually realizes this in their FAQ too by saying "After a while [chip sizes] will get more common", but it's unlikely to get common because the chip sizes are not round numbers.

For non-CM transactions with CM chip sizes to become common (the scenerio in their FAQ), other services/people need to use CM-sized chips without using CM. So CM maybe assumes people themselves split coins in their own wallets to CM chip sizes (That's how I understan what they mean in FAQ)

I'm not aware of CM-specific examples, but it's common for many mixers and exchanges,

BTW, I agree Wasabi creates a more obvious TX, but what I've been trying to prove is CM usage is also clear, even though less obvious at first glance. I wanted to warn users that they should treat CM coins dirty by default (like all mixers)

Thanks for replying.