I continue to be against All-Chat because I witnessed numerous times where the opposing team would give out positions of their teammates out of bitterness, a desire to have the battle finish quicker, or just for a lack of good gamesmanship, to put it mildly. Forever may that continue as I don't see a way to stop players from doing that again.
That being said, I'm opposed to dead teammates being automatically muted. Once again, numerous times I've seen have been players already knocked out who give out that one piece of good advice, or positively encourage teammates who are still in the battle to keep up the good fight when it's clear those remaining players lack confidence and that may be the component that can help a team win. Been several times where I've been one of those few remaining players, not really sure what I'm going to do next, and have had a "dead" teammate (good and bad) suggest an idea that I wasn't able to see. For those players who died early and leave their bitter messages, that "block for the battle" option has worked just fine for me and allows me to focus on the battle at hand rather than bite on their BS.