Not sure what your experience is, to say "definitely not the...

Not sure what your experience is, to say "definitely not the norm", or even "not a good look".

Having worked for one of the major global software companies over a 16 year period, I have experienced first hand the lifecycle of acquisition announcement, the enlargement of the board to accommodate the prior CEO and a few chosen executives from the target company, and then as the one year period comes up, have watched the new board members of the acquired company leave. From my own experience, this is the norm, not the exception.

At the coalface, I have watched the staff of the acquired company find themselves adrift in a larger corporation that feels completetly different from the company that they originally chose to join. Some end up assimilating, many do not.

The new larger corporation continues on regardless of their decision.