"Don't Explain; Learn by Doing"

[Estellios]

Another thing that helps but is a little more work is to only really bring up stuff when it's soon to be relevant, as long as there is a moment to do so. Most non-extreme, non-savage content gives you some breathing room between phase changes to throw in a quick macro message or type something if you're decently quick.

Using the Weeping City as an example, I'd tell the alliance to "run into the green puddles/orbs while the boss is casting mega death" right after the adds are dead, since you get a few seconds and it's going to be relevant immediately after and will still be fresh in their minds. I also tell groups "turn for assimilation against the Ozma Shade" when Ozma uses black hole and everyone gets sucked in since there's a good couple of seconds of that animation where you can't do anything.

Throwing out all the mechanics before a fight starts when you won't see several of them until halfway into it doesn't let people retain the information.