I suppose that brake squeal is very objectionable to somek, it bothers my wife quite alot. As long as there is no metal to metal contact, it doesn't hurt anything.
When it happens on my car I don't even hear it. Metal to metal contact on the other hand grabs my attention.
Typically it won't last very long.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in