Crowdsource it. (Microsoft could) start a website called WeHeardYouLetsFixTeams.com where users submit bug reports for Teams out in public, other people vote on how much each bug is a pain point for them, the Teams, er team commits to fixing the top 5 each quarter. Do a whole media circus around it. Do a sales push to get people off Slack/Zulip/Discord/Telegram/Meet/etc. Get some industry accolades for listening to your users.