Another mild example is that windows cannot be raised except by the user or by launching them. This is supposed to be a mild security precaution so a program can’t pop up a legitimate looking dialog over another application and trick the user. Realistically it means that applications can’t open and focus URL in your web or file browser. Instead they have to give you a notification telling you “Firefox is Ready” and make you do it manually.
I would like them to keep that behaviour. At least make it an option or allow whitelisting certain applications. Nothing I hate more in an OS than windows stealing focus without asking.