Could it, for example, mine EXP devfee, like it used to do in v10.6? Or predict/handle the reallocation failure somehow?

Passing -allcoins -1 or -allcoins epoch works, but the first one annoyingly delays first hashrate results for the user, and supplying the epoch number is tricky. Also, I'm now sure how to avoid breaking things for users that don't need it.