That syncing feeling
We foolishly ditched shared drives and had everyone move their files too Teams. Apparently, company hosted shared drives weren't secure enough !?! Now we get regular calls that Teams hasn't synced. "I've put a file on Teams and nobody else can see it" or more inconveniently "I did some work on my home PC and it isn't here in the office". Thankfully, I still use a shared drive and memory sticks and I never have sync problems.
During lockdown, Team meetings were a nightmare. I couldn't use it on my Linux box (not a fault of Linux - it doesn't have mike or speakers), so I had to take an M$ laptop home. The installed program was unreliable; at least the web version seemed to hold up.