I was told that securing nested objects with eddsa-jcs-2022 is acceptable: eddsa-jcs-2022 and nested documents · Issue #81 · w3c/vc-di-eddsa · GitHub (that question was originally raised by @helge in Use cases of fep-8b32: Object Integrity Proofs - #11 by silverpill).
Not sure what to make of it, I guess it’s time to remove warnings about nested objects from the FEP.