Oddly enough I expected to run into that problem, but in practice it's hardly ever been an issue. I think in my particular case it helps that I generally insist on using email or telegram for communication where it's important to find it again later.
But you're right. At times I've had to search for information because I didn't remember which communication tool we used.
I work on lots of projects with lots of people, and I end up with hundreds of conversations spread over Email, SMS/Signal, Facebook, Skype and WhatsApp. It frustrates the hell out of me. The great thing about Signal for me is that it also handles SMS so there's no extra app to check. But yeah, no group chats, no desktop client, most conversations are unencrypted anyway because normal people don't care about privacy. If anybody were to ask me to use Telegram I'd be pleased they had an interest in encrypting our communications but annoyed about having to install yet another app.
