There’s a setting on the phone app to block notifications when you’re active on the desktop. It works well for me.

I don’t think that I get meeting notifications on my teams on desktop either so they just come up in outlook.

There are people in my org that always start with a “Hi” and then send each sentence as a new message. Very irritating.

The idea is that you can have more data online than you can fit on your computer.

It makes sense for SharePoint when there can easily be enough data to cause space problems on employee computers.

It doesn’t really make sense for it to be the default for personal OneDrives though.