Personally, I can't see a reason to see these many people at one time.
Nine people on the screen is a nice ratio, and if the 10th person says something, they take the place of the person that hasn't said anything the longest on the grid.
There are other reasons I dislike Teams, but this isn't one of them.
they take the place of the person that hasn't said anything the longest on the grid
This is just a recipe for excluding people who don't speak up. In a larger meeting I particularly want to prompt juniors to speak up, for example. I also want juniors to see each other so they feel more a part of it.
If you are only interested in the last person to speak that's fine but you might as well just use a voice call for that.
Voice calls would reduce Zoom fatigue. I’d argue having everyone on screen at once is an edge case, and one that causes more stress than benefit to participants.
I turn my video off during video conference calls, but others may not feel they have the autonomy to do so.
Then it is on you, as the moderator, to step up and call on these silent participants. If not then get tooling that does but, FYI, none of the major video platforms have an option to avoid your recipe for exclusion.
Nine people on the screen is a nice ratio, and if the 10th person says something, they take the place of the person that hasn't said anything the longest on the grid.
There are other reasons I dislike Teams, but this isn't one of them.