How is my argument invalid?
Nudity ≠ Commitment
and the idea that she won't means she's lacking work ethic and commitment to doing her best for the project, even though there hasn't been a situation where she signed on to do a role that required nudity and failed to comply. Show me where she hasn't shown commitment to project she has signed on to do. MACHETE isn't an example. They wrote the role a certain way, but then changed it slightly to be able to get her to play it. Something which happens ALL THE TIME in Hollywood and everywhere else. SALT was supposed to star Tom Cruise ffs.
You are making pretty definitive character judgments (though you said no one should judge her) based one one thing, as if nudity is the be-all-end-all, without taking into consideration that there are very likely numerous other things that she's done for the sake of a project that she found difficult of uncomfortable. Point is, don't be so quick to lump people as one thing or the other when you know very very little about what's actually going on.
Even the best actresses turn down scripts for various reasons relating to the characters they would be tasked to portray. None of them I can think of is indicative of a character flaw.
Your GROUP A / GROUP B categorization is too narrow, simplistic, and naive. How many of those actresses that you'd put in GROUP A would star in a film like 9 Songs, where they'd have to have explicit sex? By your logic, they all show a lack of commitment and an unwillingness to push personal boundaries, even though they didn't agree to be in the movie to begin with. The fact that they would never do unsimulated sex onscreen for any movie has to say something about their work ethic, no?
How many of them argue with the writer and director over lines, character motivations, etc? Are they too lacking work ethic? As I said, your guidelines are much too simplistic, as is your main premise.
Besides, the one role she's done in which some form of nudity would be required for the good of the movie (The Killer Inside Me) she at least stepped to the plate and showed something. I'm willing to bet that the bit of nudity she showed was the least uncomfortable thing she did in the whole bloody movie. She was brave to take the part.
You're making me defend Jessica Alba for fuck's sake, and for that I will never
If you still play (?) dumb after reading this lengthy diatribe, then... then I guess this stupid argument will still continue
But without my involvement. I'll just be a spectator.