These particular extensions come across as "long-tail" things that are probably worth standardizing, IMO. Not every core needs cryptographic acceleration, but t

These particular extensions come across as "long-tail" things that are probably worth standardizing, IMO. Not every core needs cryptographic acceleration, but the ones that do need it tend to really need it for those cases. Similarly if you need hypervisor mode support, there are basically no alternatives to just having it, and it requires enough software support to the point you probably have to standardize it, if there's any hope of it working. There's also the advantage that these give a baseline for vendors and software to target instead of rolling their own, within sensibility (though they may choose not to). Some of the other drafted extensions not mentioned here are perhaps more questionable... All three of these are complex enough to definitively increase the design/verification time for any core that implements them, though, that's for sure. (A net effect of this is that while there are tons of simple in-order cores, actual "production" RISC-V cores with features like this will remain rare...)