Re: Without open source there would be no leftpad
Just because they're old, doesn't mean they're good. Tables are generally agreed to be bad unless you're actually representing tabular data, i.e. what they were designed for. I've yet to meet any web developer in the last 10 years who doesn't advocate CSS, it works fine cross browser unless you target ancient versions of IE.
Using tables you're bloating every single HTML file with presentational info, rather than allowing the browser to cache it once in a single CSS file. If you want to modify your site's design you'll have to edit/rebuild each HTML file rather than a single CSS file.
Tables are also slower to render in the browser since they need to be processed in full before any rendering can begin.
Last but not least, using table tags is actually more long-winded than using divs.
tl;dr Shitty code can often be quicker to write but it's a bitch to maintain.