Honestly, I like that it doesn't have it. We use Teams for meetings where one person is presenting, and if someone else wants to share, then we're going to switch presenters. Making sure everyone sees the same thing is important.

We use Slack for 1:1 or other impromptu small group discussions, and it supports multiple people sharing their screens.

So for us:

• Teams - larger group meetings with generally one presenter; collaboration happens via audio, not screen sharing
• Slack - smaller group meetings where there's a lot more active collaboration with screen sharing and whatnot

I only use Teams for scheduled meetings and Slack for everything else.