Every now and then I will have to reconfigure my parents PC because Microsoft “forced” them into changing the browser default.
I honestly don't believe MS forced your parents into using Edge maybe you could post link to a screenshot when this occurs.
I have been using Win 10 with Firefox for years and while some MS Apps do open Edge and maybe ask if you want to change to Edge as your DEFAULT browser I've never seen them trying to force me. It's also like everyone has Google Chrome on their computer because a lot of downloaded software has a checkbox which is ticked by default asking if you would like to install.
To get back on point, as well as the above neither does MS NAG me to change to Edge.