The question is, is it normal to combine layout with blocks and flexes, or is it just one way or another?

Question

Layout

Due to such a layout, there are big problems with adaptability, something is normal for the screen, but something remains in place and does not work out normally

Answer 1

You have a question in one thing, but the problem is in another)
I decided for myself like this:
- tables for tables (and even that is rare)
- grid for a grid, site frame (or instead of tables)
- flex for everything else
But this does not mean that you can write styles for the desktop, and the mobile phone itself will show everything beautifully.
It is necessary to prescribe styles for different screens through media queries