We LOVE using Teams to screenshare and train. And it's most valuable when the person doing the learning is also doing the screensharing so they can learn "hands on". But... that means the instructor has to tell them where to move their mouse, etc.
Some pages (e.g. AzureDevOps screens) have a LOT of text on them and it's VERY time-consuming to get someone looking where you want them to look. They can literally have their mouse right next to what you want them to see and they still don't see it. And then some people get scroll/move/click happy making simple things very frustrating and time consuming.
If as a meeting participant, I would LOVE to ONLY share where MY cursor is on their screen. It would be SOOOO much faster than trying to walk them there with words.