> a lot of folks are perfectly competent developers but can't move forward and eventually get replaced by younger/cheaper developers because they are basically

> a lot of folks are perfectly competent developers but can't move forward and eventually get replaced by younger/cheaper developers because they are basically doing the same thing for the past 10 years I'd argue that they are replaced (if they are, because I'm not sure, there are not a lot of old folk because IT industry is pretty young, I already worked with a few 50+ mid devs and the pay is kinda reverse, because old folk already have homes and don't need to pay off huge mortgages) not because they didn't get promoted (mid dev -> product owner / domain expert) but because they stopped upgrading the skills relevant to their current job. So in terms of the example presented by the author it would be developers that are no longer even hyped about languages/tools. And in our imaginary "tiling specialist" it would be a guy that didn't care that the current fad is some kind of funky pattern + new material of tiles and still wanted to lay old ceramic square tiles for his entire life. I'm still not convinced that there is a scenario where you __have to__ care about "the domain" / "the problem being solved" / "the bigger picture" that much. You can, it will improve some aspects of your career, but you don't have to and it would degrade other aspects of said career (we all have about 16h max productive hours daily, and I'm being generous).