Unblockable for bosses (and in general) is just lazy
I understand I'm in a small minority here but I'd like to point out that the use, and objectively overuse of, unblockable for any defender, but especially in quests, is just lazy quest design. Look, I'm never going to be the greatest player, and I don't mind having to use revives and health pots, but I do expect a game to be fun, not frustrating.
I realize that the devs at Kabam care about revenue first, but fun should be goal #1. When I'm having fun, I spend. When I'm frustrated, I leave the game for a few days and definitely don't spend even when I come back. I'm not asking for easy, just a lot more thought about nodes, the champs you're putting on those nodes, and to highlight that unblockable has become a go to node or champ to put in places that you want to trip people up so they have to use/buy resources.