These things are trivial compared to what other fields of software engineering have to deal with (and other fields have to deal with all this stuff too along with extra harder stuff as well)
At the most advanced levels of pure web dev it is still FAR easier then other fields of programming. It only gets a bit harder at massive massive scale, which 99% of developers are shielded from through frameworks or the fact that the company itself doesn't deal with that level of scale.
These things are trivial compared to what other fields of software engineering have to deal with (and other fields have to deal with all this stuff too along with extra harder stuff as well)
At the most advanced levels of pure web dev it is still FAR easier then other fields of programming. It only gets a bit harder at massive massive scale, which 99% of developers are shielded from through frameworks or the fact that the company itself doesn't deal with that level of scale.