Yeah I can see that.
However, you are now arguing a different point than I am getting from your original post. Maybe my fault in interpretation ofc, but the main difference (in my view) is:
You say "incompetent" and "less skilled" as general statements on senior engineers. Those statements are false.
You also say "missing the skills you are looking for" which is obviously true.
And the implication that before cloud, people developed the specific skills you need more naturally - because they had to. This makes sense and I believe it.