I don't know the authors, so I can't say they aren't giants. Some were written by people who have some respected modules behind them. What I can say, is that none of the thread pool modules came close to meeting my, what I think to be a relatively common and simple, need.
The same can be said for many of the similar modules for forks.
Many of the thread and fork modules are old and fail installs or install with insufficient testing to identify problems with running under new versions of perl. The good and the bad of CPAN is that you get to see everything. It would be great to be able to select some filter, like known to work on 5.10 and greater, or actively maintained. I think that would focus people in on modules that are reasonable for consideration.