Creators of XMR Stak? Well, they're doing it wrong all of a sudden then...
Mistake 1 - Dedicated OS
Makes sense for coins mineable with GPU mining rigs, but most home miners are using their computers for mining Random X coins that they need to be able to do a lot of other things on. So, any RandomX miner hoping to get widely adopted would have to work with mainstream operating systems.
And let me guess, to get the 10% speedup, this OS is required. To eliminate it would mean to lose the 10% gain.
Mistake 2 - exclusive pool, high fee
This miner only works with its own pool. And there is a 3.5% fee. When other miners and pools offer a lesser fee combined, what's the point?
Fix these two issues, and then we can talk. But I bet that they won't do it because they know that if they do, they won't have a noticeably faster miner than XMRig.