SEO friendly URLs can even be harmful says google

[Mitsakis]

Why everyone gives so much importance to the so called "SEO friendly" urls?

Today I came across this article from google:
Official Google Webmaster Central Blog: Dynamic URLs vs. static URLs

Does that mean I should avoid rewriting dynamic URLs at all?
That's our recommendation, unless your rewrites are limited to removing unnecessary parameters, or you are very diligent in removing all parameters that could cause problems. If you transform your dynamic URL to make it look static you should be aware that we might not be able to interpret the information correctly in all cases. If you want to serve a static equivalent of your site, you might want to consider transforming the underlying content by serving a replacement which is truly static. One example would be to generate files for all the paths and make them accessible somewhere on your site. However, if you're using URL rewriting (rather than making a copy of the content) to produce static-looking URLs from a dynamic site, you could be doing harm rather than good.

It's much safer to serve us the original dynamic URL and let us handle the problem of detecting and avoiding problematic parameters.

what do you think about that?
do you use URL Rewriting?