The problem is smartphones.

You literally can't make a website from the 2000's nowadays, because that means you want a 800px fixed width layout or something of sort.

If you do that, your website will look absolutely gorgeous since the 800px width + precise pointer + hover requirement allows you to get rid of all unnecessary whitespace, explain the UI with tooltips, and guarantees you always have enough width for one sidebar, but it won't be responsive.

The real solution to the modern web is to destroy all mobile devices on the planet.