People do still say that...

Most people who create framed sites do make the mistake of making it impossible for spiders to crawl.

But there are ways to make it easy for the crawlers and if it's done right they'll crawl every single page that you can make and upload.

I've got a game page on a mainstream site that has to have frames because I'm using an affiliate template of their top web games -- it does just fine.

Several years back I did the SE work for a BDSM toy store that was using frames. It did excellent! Too bad the owners were goofs and let their biz die.

I've got a link somewhere that will show you how to set up a frames site for the engines.