> Most countries will grant PR without requiring a language proficiency

Hmm, is that really the case? Or perhaps you're confusing work visas with permanent residency? Most attractive destinations for immigrants usually require a language test for PR. Ignoring the United States and its dysfunctional immigration system, a language test is required or practically required almost anywhere there is a points-based system to obtain PR. The UK requires a language exam to be granted leave to remain. Canadian federal programs for PR require a language test result to even be considered for the Express Entry program. In Europe, Germany, Austria, Denmark, Norway, Sweden, Italy also require it, and I'm sure there are more I'm not aware of.

Also, B1 is honestly a very basic level of proficiency with the language. It is really hard to be a productive member of society and interact with locals if you cannot speak at a B1 level.