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Re:JDK 8 Release Notes by pjmlp on Wednesday March 19, 2014 @12:29PM (#7429784)
Usually because the said developers are too dumb and do everything on the UI thread.
Re:JDK 8 Release Notes by coldtea on Wednesday March 19, 2014 @04:38PM (#7431693)
Yes. And things are a lot better now, I remember using IBM WebSphere UI tools (written in Java) circa 2004-5.

It took several seconds of whited-out buttons and stuck UI for every CPU intensive operation -- all on the same thread. And that was from IBM, and from tools that you paid for a small fortune.