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I believe it's a little of both. There are numerous developers who are updating their work, though. Some are working on their modules as they have time. Some are waiting for 2.2.x to stabilize more. Your best bet is to visit the developer's homepage of the module you are interested in. Generally, it's not very difficult to figure out if they are still working on their module.
I'm chomping at the bit myself for a few of my favorite modules to be ready for 2.2.x, but since I cannot code php, I have to wait. All in all, patience will prevail.
Hope this is helpful.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.