Where I live herbal cannabis and hash are treated essentially the same as far as I know, you can definitely get a caution for buds here and I have always assumed that applies to hash, as it is cannabis. The only difference that I am aware of is that it is takes a smaller amount of hash in someones possession before they can be charged with dealing without any other proof. I don't agree with criminalising cannabis, or any drug for that matter, but it does make sense that a smaller amount of hash would typically equate to more doses in most cases.
I smoked a lot of hash when I visited the 'Dam, but I tended to stick to more traditional varieties than the really high thc/generally expensive as fuck stuff. There is plenty of that stuff around though, I never smoked it so I don't know if it is oil or what but for what some places charge there it would want to be as high of a purity as oil gets to. I can't imagine there is some kind of restriction against oil of any form, regardless of THC%. I seem to recall a while ago it was proposed to ban any cannabis over 15% THC being sold in coffee shops but as far as I am aware that never passed, and when I was there a bit over a year ago some places certainly claimed a higher percentage than that.