Sure - I agree with that, and I agree its good for society but as you state probably not as good for the SWE who has to work harder for the same which was my point and I think you agree. Other professions have done what you have stated (i.e. certification) and seen higher wages than otherwise which also proves my point. They see this as the "street smart" thing to do, and generally society respects them for it putting their profession on a higher pedestal as a result. People respect people who take care of themselves first generally I find as well. Personally I think there should be a balance between the two (i.e. a fair go for all parties; a fair day's work with some job security over a standard career lifetime but not extortionary).

Also your notion of "better tools" may of not happened, or happened more slowly without open source, AI, etc which would of meant higher salaries for longer most probably. That's where I disagree with the parent poster's claim of higher salaries - AI seems to be a great recent example of "better tools" disrupting the premium SWE's enjoy rather than improving their salaries. Whether that's fair or not is a different debate.

I was just doubting the notion of the parent comment that "open source software" and "automated testing" create higher salaries. Usually efficiency economically (some exceptional cases) creates lower salaries for the people who are made more efficient all else being equal - and the value shifts from them to either consumers or employers.