Not necessarily. It depends on the company acquiring. I've seen M&As focus solely on the relationships (ex, customers), so the tech DD was just checkboxes without deep dives.
Not necessarily… what? This is my actual professional experience. I’m sure people just buy things without any due diligence somewhere but I have never seen it.
In one case my judgement was that the customer list was all that there was of value. They opted to not buy that company.