The experience says that a little error in the baud rate is acceptable

I am not arguing that the baud rate has to be be perfect to "work", what I am saying is : "select your crystal for the UART, not the uC". Why use the wrong part when the right part is readily available. If you go from 11.0592 to 12 to squeeze a little more performance out, you are already too close to the edge and will fall off.

Errors and variations will occur, why add to the load by buying anything but the right part. Is this about "let us see what we can get by with" or is about "what is the right thing to do"

Do ir right, it is more fun,

Erik