What's left to explain?

Vader's dialogue regarding the carbon freezing:

This facility is crude, but it should be adequate to freeze Skywalker for his journey to the Emperor.

He doesn't seem unfamiliar with the process.

I don't know why some of you don't complain about they using blasters. After all, it's lack of creativity too, isn't it?

If carbonite exists in the Star Wars universe, in what sense does it show lack of imagination? It's not like a villain is frezzing someone in carbonite to see if the facility is okay for his plan to succeed.