Wikipedia avoids original research for a very good reason: to keep out physics cranks and the like, who would infest WP otherwise.
Now, we all know a Wikipedia page doesn't have the weight of other sources and can be crap at times but so far it's a total class act and it has a lot to do with these policies.
I'm sure you know that Wikipedia has to constantly police itself for large companies trying to mess with competitor's pages and how there are armies of political operatives out there trying to rewrite history through Wikipedia. This is why even experts like the OP are so scrutinized.
But why? If there's an article about your company in a legitimate publication, I don't see why there shouldn't be a Wikipedia article about it. How would it make Wikipedia a less useful or lower-quality resource? Are you saying it would get in the way of finding information about more "notable" subjects? I don't understand how.
Sure, my attitude would make the disambiguation page for "John Smith" much longer, but I think it would still be reasonable as long as it's well-sorted into categories (as it is now).
The problem is that getting rid of the notability requirement would lead to lots of people putting up pages with nothing more than opinion. It wouldn't be spam. It'd be more dangerous than that. It'd be unsourced opinion disguised as factual information.
There's also the fact that Wikipedia is much more of a finite resource than, say, Google. Google has millions of server and a data center staff of thousands, backed up by even more thousands of programmers dedicated to making things run smoothly. Wikipedia is 400-odd servers and a staff of less than a hundred. Opening things up like you say would quickly overload Wikipedia's infrastructure, degrading the encyclopedia for everyone.
It seemed like the person the blog post was referencing passed that requirement as well, but was deleted.
If you can refute this, please follow the very clear instructions (http://en.wikipedia.org/wiki/Wikipedia:Deletion_review#Instr...) for doing so. For the deletion review to have any chance of succeeding, it _must_ go over some new point that the previous AfD ignored. Giving new references that are specifically about the person in question would probably work. Simply saying "but, but, she's important!!1! :( :( :(", on the other hand, won't go over well.
I've been on the other end of this. The shitty little start-up I worked on for many years somehow managed to squeak past the finish line of notability and keep its shitty little Wikipedia entry from being deleted (despite the fact that it was mostly written by the marketing department). And you know what kind of difference it made? Absolutely none. To the best of my knowledge, precisely 0.0% of the site's traffic came from the 'external link' in the Wikipedia entry. We got precisely 0 phone calls or emails from potential customers who heard about us on Wikipedia. VCs did not magically dump piles of money on us because we were listed on Wikipedia. Engineering candidates -- even bad engineering candidates -- never spontaneously sent us their resume after reading our Wikipedia entry.
Conversely, given that my startup benefitted not one bit from having a Wikipedia entry, I'm quite confident that if a competitor had wasted 15 minutes of his time to deface our Wikipedia article, it would have hurt us as a business not one lick.
It is a fact that these things happen and whether it's harmful or not it isn't right and it's the reason for these policies.