Nope, you are doing good. I did floats and positioning for over 10 years and still like it.
In my opinion however Flexbox and Grid have a decent advantage when it comes to responsive/fluid layouts. Grid and Flexbox scale by design while floats and position feel static.
In my opinion however Flexbox and Grid have a decent advantage when it comes to responsive/fluid layouts. Grid and Flexbox scale by design while floats and position feel static.