That does not seem to have anything to do with the fact that almost nobody uses it, whether it is faster or not.
An employer watching someone filling out a job application under the duress of the above-described disability would certainly think twice about hiring. Maybe it's covered under the ADA?
With all due resepct, I still see it plenty and use it myself plenty (especially if I want to jot notes down as fast as I can and not have to lug my laptop around). [And that's coming from a guy that's using a computer 95% of the work day.]
I'll agree that block writing has an advantage or two, it's certainly more readable and most everyone can make a font that looks the same that way. But it ain't worth the time (unless of course one's cursive is really poor).
In fact, I think we'd all agree.... this thread ain't worth the time either.