Proof of Stake should mean running the software. If it's not good enough for that little bit of a stake, you must provide incentives for others* to run it, and

Proof of Stake should mean running the software. If it's not good enough for that little bit of a stake, you must provide incentives for others* to run it, and this is going create imbalances somewhere. * - in a real sense, this is users, not-using, and offloading the work to those who would probably not actually use without incentive; the only difference between a PoW and a "put your money" type of stake, is that now you've added an entry fee that is hardly different than licensing (as in professional licenses, for various trades).