KevinM
I believe the shoots you refer to are known as Epicormic shoots and generally indicate a severely weakened plant. The pruning itself is rarely, if ever, the cause of death or decline. In the same way AIDS is not the cause of death in a human patient, but rather the persons body can no longer fight off the most basic cold or flu.
The Oak trees mentioned above, obviously, are experiencing high stress levels. If you add to that stress you can most certainly kill the tree.
The following is an account of what happend to a oak that was on a large estate across from the golfcourse I was working at.
A company came in 7 years ago and removed about 40 percent of the crown on a 60' Quercus. The tree then developed Epicormic shoots, followed by severe wilting in the summer. Over the next 5 years the tree continued to decline, most likely due to an inablility to compartmentalize the pest causing the decline, and was removed last year.
In referance to certified arborist I can only say that all the ones which I know of do a good job and are very knowledgeable. I am sorry to hear that your opinion of certified arborists is so low. After 10 years in the Horticulture/Arboriculture business I am taking my ISA exam this fall.
Jim