The biggest drawback of sites from this era is they don't reflow on mobile screens. On a desktop they still work as well as they ever did. I'm still searching for a good WYSIWYG HTML composer that can generate clean, responsive pages. Seems like this is a problem where there isn't sufficient incentive for the big tech companies to tackle, and the only s/w that seems to come close is BlueGriffon.
That's a client side problem, not a server side problem. The rendering and presentation of a webpage are entirely up to the client, absolutely nothing dictates that a page should look a certain way on a certain client.