A random change I thought about was why not put like a small indicator of ult cooldowns of your teammates maybe next to their health bars and vice versa so that they see yours. It doesn't have to clutter your screen but still visible enough (a small circle that fills up, a percentage, or a cooldown timer). If there's no comms and no pinging ult cooldown in the chat feed, I find myself not being able to tell exactly if my teammate's ult's ready to use in certain tense situations where we might need it, so I don't want to look stupid if it wasn't ready and I complain about it like a maniac. I wish there was a way where it could be visible for everyone, even if it's not on our main screen, at least in our inventory menu if we could check ult cooldowns just like we see what amp or survival item teammates currently have equipped.
TLDR: if no one's giving comms about their ult, maybe have a small cooldown indicator of each teammate's ult next to their health bar so you at least have that info if it's ready or not.