I think some frame builders don't like titanium because they are not skilled enough to work with it.

When I bought my custom Co-motion in 2003, they claimed their aluminum road bike frame, the Ristretto, was better than a titanium bike. I had to check their site and they have removed that sentence.

I really like Thorn/SJS Cycles and have owned a couple but they lose a little credibility with this nonsense:
"It is either impossible or extremely expensive to have the required fittings on a Ti frame and furthermore, all titanium frames, that we have known, have also broken! It is usually impossible to repair a cracked titanium frame. Perhaps there are some titanium frames, being made today, or which may be made in the future, that won’t break...but we doubt it."

Maybe they are talking about English made Ti frames...or are there?