Does validation (writing valid markup) decrease your development time?
I'm quite familiar with standards-based web design. I've produced several sites that validated correctly. However, upon reflection, producing code that validates has not decreased my development time.
My pages need to work in the major browsers: Netscape4, IE5+ (Mac/Win), Mozilla. I can't forget about Netscape4 and I can't give Netscape4 users a degraded, text-only version. On many pages that I create, about 15% of users are on Netscape4.
There seems to be an almost pathological obsession with some people for validated code. I'm merely content with pages with work identically in the above mentioned browsers.
Has producing valid code (according the the W3C validator) increased your productivity (as the web standards project claims that it does)? My experiences have been negative.