Clicking a Teams meeting link from Outlook Calendar opens the pre-meeting screen to allow enable/disable of camera/microphone, plus it also loads up a little reminder window with Join and Dismiss buttons _over the top_ of the Join button of the pre-meeting screen.
Every time.
And then there's the fact that, if Teams wasn't already loaded, you can be up five minutes late for a meeting waiting for Teams to roll out of bed despite having clicked Join bang on meeting time.
I don't have the most up to date system at work, but it feels like 90s wait-computing.
Quite often when I use a 1990s system, I encounter several things that are instantaneous, while modern machines take several seconds.
Like, sending an empty folder to the bin:
Win 10 this afternoon took seconds to display a dialog box with no content, the a couple seconds to add a progressbar, then a second to add the cancel button, then multiple seconds to finish showing progress.
But at home a 1991s system with System 7 completes the same task instantly without needing a progressbar.