I like this idea in principle, however...
Deciding how to make an exception takes quite a bit of human reasoning.
Devoid of this kind of logic, MusicBee would have just to add an exception rule for each track deleted.
So you could potentially have hundreds of exception rules in the autoplaylist.
Given the choice between that, and making a more intelligent exception rule myself, I think I'd usually
just manually change the rule set, and not really use the suggested feature.