Comparing concussions and recovery is a losing game. Every concussion is different and every recovery is different.

The fact that things do get better should be accepted for what it is, a general prognosis.

The most of "things get better' is a result of the behavior and attitudes of the subject. Learning and finding work-arounds to the difficulties is the most important. The rest is just time and good nutrition and behaviors.

The anxiety of 'why am I not getting better like so-and-so' is counter productive to recovery.

If asking about another's concussion is for the purpose of supporting that person, then the questions are fine. If it is to compare recoveries, it is counterproductive.