There was another thread about this not to long ago where the idea of a general penalty of some kind be applied instead of limited use.
As I said there, I'd be ok with that type of system and also commented that I though it more akin to the older called shot system.
Personally I'd also like the current system to be expanded on and opened up a little.
Some people are against these attacks altogether though as they see them as too arcadey and/or not 5e(which they admittedly are not).
