[_lex]

Especially on teams where you deliver a lot of product quickly, it can be easy to develop and maintain both skillsets.

You hear about it in the web developer context (and especially not in finance) because they tend to have quicker iterative cycles, and therefore may be doing quite a bit more coding. There may also be a cost, corporate maturity and scale component as well. ( At scale, you want to depend on fewer exceptional people, and many more average people, doing average things. Fullstack is still seen as exceptional, and its hard to scale exceptional).