Really depends on the game and community for me, some more fast-paced games the mic feels much more necessary for tactics, even if it sometimes means dealing with toxicity here and there!
Yeah I feel like anyone in plate just needs to get a hand on someone without armor and it's over. Some YouTube videos have good examples of how fast people can move in plate as well, faster than you would think!
Good exercise always helps! Not only just for your health in general, but after a good and long day with some exercise thrown in I find it a whole lot easier to fall asleep.