This is a myth that has not been true for a long time now. Tomcat handles static content just fine.
In terms of response performance, yes. (My google for metrics only turned up TC4 vs. httpd 1.3 comparisions.) But features I need for static content (such as URL rewriting, header tweaking, etc.) are just not there in TC. I would also be sceptical about scaling but without any numbers to back it up...well, who knows?
"This is not to say that design is unnecessary. But after a certain point, design is just speculation." --Philip Chu