You will regularly hit the language wall in places like shops, post office, neighbors etc. where answer in given language if they speak english is consistently "no". Integration outside big cities is a lot about you becoming like them, not vice versa, better keep the differences compared to locals behind doors of your home. Smaller cities, more rural places - forget english outside tourism, many young speak it but otherwise there isn't much will and often neither skill. French part is worse than German part in this (just like French from France are much, much worse when it comes to will to speak english than Germans from Germany are).

Great standard of life but can be isolating for some people. Unless you are happy sticking to the expat bubble, nothing wrong with that.