I wasn't talking about you, it was just a generalization, but i'd like to address both your concerns. Prior V5 there was no hair shader in Corona. Yes, it has some limitations in combination with max's H&F, but it's not some new bug introduced in Corona. Regarding displacement and CoronaWire map, AFAIK it still works with old displacement, but it's not supported in new displacement, which was simply not present in previous version, so it's not fair to say "it worked before, but now it doesn't". New tech is not always compatible with legacy stuff, but i don't think it's developers' fault. If they will find a way to improve functionality of new tools, they will definitely add this to new versions.