I think it's something analogous to Jevons' Paradox.
Jevon's Paradox, originally written about the use of coal, noted that as it become more efficient to use a resource, the end result was generally not that less of that resource was used, but in fact more.
I think the same thing has happened in frontend development: Tools which were written to make development easier have not had the effect of making it easier to do frontend development, but have made it possible for outside factors (product managers, customers etc) to demand ever more from frontend devs.
That's it. It's induced demand. Build roads with more capacity, and more cars will appear to use them. Build frameworks with more capabilities, and more tickets will appear to use them.
Jevon's Paradox, originally written about the use of coal, noted that as it become more efficient to use a resource, the end result was generally not that less of that resource was used, but in fact more.
I think the same thing has happened in frontend development: Tools which were written to make development easier have not had the effect of making it easier to do frontend development, but have made it possible for outside factors (product managers, customers etc) to demand ever more from frontend devs.