Frequent updates to "DirectX Runtime" and "Visual C++" from the Microsoft Store

Exactly the same here too. I have four altogether the last one was a very small Direct X Runtime update.
My graphics in MSFS looked much better after all of this however, I cannot attribute this improvement to the update in all certainty as I had installed a new display driver too.

My Realtek audio drivers are also being updated through the store as well.

I see you have a pending update to Win 11 too, I think this could be the key here.

Charles.