This is gonna sound like a troll post but i assure you it is not.
I don’t have a coding background but I’ve used Teams in a lot of workplaces and really only encountered like 2 issues entirely.
Either I got seriously lucky or it was before enshittification.
Why do you yourself dislike it? Is it UI? Performance?
I should also say I use Teams for basic purposes like messaging and uploading files, I literally don’t touch anything else and performance hadn’t been an issue. (Likely because I’ve been given thicc-ass workstations in the past)
This is actually a problem with a lack of presenter training, not technology.
When presenting slides, text should be formatted for mild vision impairment. When screen sharing, you should either lower the resolution of your screen, or share only a single app and make it not take up your full monitor, or boost your text size.
In your case, even if Teams allowed it go properly full screen it may be enough for your needs, but there are people who it would not be. There are people who operate “zoomed in” all the time on a PC due to their vision impairments. Catering to these people makes content accessible to everyone.
The other big part of this is colour/contrast choices, since those are also common vision impairments.
There is a tradeoff. When someone is sharing a screen I want to see more of their screen. A powerpoint should 10 lines mx of large font. A screen share often needs me to see what they do and zoom in loses useful lines - to teams things I don’t even care about.
You don’t care about them, but they’re very useful to other people.
The thing you need to remember is that not every single feature or UI design choice is about your specific use case.
I can still hate choices that are hostile to my ability to use teams. I still miss lynx which did much better for my needsi