Making it pink doesn't "dumb it down". Making it a simpler build with fewer pieces does. The vet clinic- your example- is only 343 pieces, and looking at the description and the photos, at least 50 of those pieces are accessories- not buildable bricks. The building itself is not a building, only a facade.
The pirate ship you mention is 804 pieces, which don't include accessories like hand mixers and hair dryers. It is mostly bricks. I can't find a build-a-wookie set, but one that includes a wookie, the Battle for Endor kit is 890 pieces, including a At-At with movable walking legs. i don't see anything comparable skill or ability wise in the girls-specific line. Which means
Lego thinks either:
A. Our girls are not interested in building workable moving pieces
OR
B. That they are not capable of complex builds.
Which is less offensive to you?
The creator sets allow for an easy, regular and advanced build within each set. Each of those 3 levels is an actual building- for walls and a roof, usually with a hinged wall or removable roof to allow play. not just a facade- which all of the Friends buildings are. They could aesthetically improve upon these existing sets to appeal to girls if that was the intention. Instead they made the girl versions simpler.
The most complex set (Olivia's house) is 695, which again, have a lot of accessories. Again, it is a simple facade not a complete building, making it a simpler build.
Should I just replace the word "dumbed down" with "simpler" and you'll be o.k. with the argument?