A) Oh bullpucky. It worked well enough _for the essentials._ The only important sense that "the project has grown since then" is the number of WP pages and pageviews, but all your visual editors and umpteen new wikithis and wikithat projects haven't changed how that works in any significant way.
B) You forgot to answer the primary question: What is there to say that all the other shtuff the WMF is doing lately isn't secondary to Wikipedia, that Wikipedia isn't by far its most significant product and project? Do you have any actual support for your thesis that this is not the case ("Not so for some time"); _who does_ actually care about all that -- besides yourselves! -- and _why should_ Johnny Q. Eyeball care about any of it?
Because it's not 2004 anymore. What worked perfectly in 2004 (which btw it didn't, people complained back then no less than they do now), doesn't work that perfectly now. 10 years is a long time on the Internet, and the project has grown since then.