Everyone has their own opinion about components for every part of rifle designs. Integral bases were a result of the push for so many actions to have integral rails which saved the process of attaching rails with screws and pins. In the beginning, we found the potential for rails attached with the screws and pins to work their way loose during a few of the roughest challenges when shooting PRS competitions.
The fastest solution was to use Loctite on the screws to resist that loosening. However, enterprising manufacturers made the decision to change the design with fixed or integral scope bases.
At one time I was holding over 3 dozen different bases in my shop in order to accommodate a client's desire for a particular base design to add to an action. Now I order actions with a base machined into that action.
However, if I need an action without an integral base, I use a different action. This occurs when I need more than the often offered 20 MOA base or a zero base.
We as a nation, are benefited greatly by the number and variety of actions and other components made available to us by the manufacturers. I for one am grateful for the much more impressive selections available to me.