I’ve a question on that (same question applies for uni, snx, crv). Looking at the top 10 holders of these v2 assets a lot of them have mixed positions (e.g. mkr+uni collateral). Therefore when one of these assets is put in isolation a migration relying on mixed collateral will not actually be possible.
Non of these assets are currently frozen on v2 and can potentially be used as collateral with no restriction as I understand the pool configuration. How can it be that on v3 these assets - volatile, but with a long track record are now deemed isolated, when at the same time there are no concerns on v2? Afaik they are borrowing disabled, so I would have assumed the same on v3 or a restrictive borrow cap, but isolation makes a migration to v3 impossible/unattractive.