Keeping OT, do you think Tegmark is woo-ish?
Not really. Or maybe just
sort-of.
I think that like many physicists Tegmark speculates excessively when he's writing for a lay audience. That's my biggest objection to him, I guess. (It can be fun to read though, interesting and very thought provoking.) He isn't alone. If you look at the science bookshelves at pretty much any mass-market bookstore (and university bookstores as well, the Stanford bookstore is just as bad) they are filled with books written by scientists that purport to answer all of history's oldest and deepest questions.
"Scientists" have somehow become our culture's new metaphysicians (and perhaps increasingly, prophets). And metaphysics is precisely what Max Tegmark is doing.
That doesn't necessarily make it "woo". But presenting it to laypeople as if it has all of the authority of "science" might make it something worse than "woo".
In his defense, I'm not sure that Tegmark actually does that.
Something that W4U never seems to mention is that Tegmark appears to have labeled his
Mathematical Universe chapters according to whether they are mainstream, controversial or very-controversial. His most exotic mathematical universe speculations have been marked 'very-controversial'.
W4U seems to want to quote Tegmark's most extreme and controversial opinions with a "Tegmark says...", which in this context just means "Tegmark speculates".
So all in all, I suspect that W4U is being more "wooish" than Tegmark, assuming that Tegmark does make it clear when he's speculating and not speaking with all of the assumed authority of "Physics". In my opinion, Tegmark may or may not be borderline-woo, and W4U seemingly threatens to push it right over the edge.
The distinction between scientific speculation and well-established science is important. It's a distinction that in my opinion "Scientists", our culture's new authority figures, should be more aware of and more scrupulous about observing.
I don't like scientists occupying that priest-like all-knowing authority role, and don't think that they are always qualified to occupy it. I do think that professionals knowingly bullshitting the public is much more dangerous than "woo" (whatever that is, it's never been clearly defined). When the public senses that it's being bullshitted, it just feeds their skepticism about science generally.