I think people are reading too deeply into what was said.
After all, there has to be come class changes to accommodate the loss of our artifacts. Some of those artifact abilities are becoming passive or being baked into the class.
What I believe is more accurate is that the huge, sweeping class revamps we saw in Legion will not be repeated.
Some specs clearly require more work, such as ret paladins and I have no doubt those specs will see a considerable amount of attention in the beta.
But overall, I think less change is good.
Most of the specs worked out fine and are probably going to be left alone. People are right, Blizzard needs to stop reinventing the wheel with every expansion.