Like, I imagine if I moved to a country and couldn’t do the B1 things in their language, I would have daily obstacles doing basic life things.
A lot of societies are set up to accommodate that society's dumbest members, and tourists, for most everyday tasks.
Outside of the workplace and my hobbies, I can't remember the last time someone asked me to read more than a few words, write anything at all, or do any maths more complicated than "the 12:20 train is 10 minutes late"
Personally I would say it's not respectful to a society to move there and not make a decent effort to learn the language - but I have no doubt a person could survive with only basic skills, if their workplace worked in their native language and they had an ethnic enclave as a support network.
That is not true for many countries, especially in EU, and especially when you move as a skilled worker.
> I would have daily obstacles doing basic life things.
That heavily depends on the city and country. I don't know where OP is, but for example in Berlin it's kinda rare to meet people not speaking any English, basically mostly old people/retirees don't.
There are gyms where people speak English, cinemas with English subtitles, all kinds of doctors speak English, even a lot of bureaucracy like driving exams etc. can be taken in English. Speak to a random person in English, odds are very high they respond back in English.
I'm not saying this to mean it's 100% easy of course. Default language is ofc German, and not knowing it locks you out sometimes. Just saying that it's possible to live in a city like Berlin and not speak the language, and most days you barely think about it. I'd say it's an obstacle once-twice a month rather than daily.
Not in most of Western and Central Europe. Everyone speaks great English.
It actually can be a problem because most people switch to English as soon as they realize your are not a native speaker, which can make learning harder.