Now that there's precedent that the second amendment includes when lawfully facing cops, no-knocks are for war zones. If you aren't living under declared martial law, then a given officer either has the skills, training, and confidence to safely execute a knock-and-announce, or they have no business being in the stack when the door gets kicked in.
While I'm at it, felony murder is a chickenshit charge used by weakling prosecutors who know they don't otherwise have a case. It shouldn't exist.