Verion I lost interest in burr swapping in grinders designed for specific burrs, excepting applauding Tom’s project.
When I thought about it, there was no reason a third-party burr would be an improvement, just different, and likely worse. There’s no secret sauce in burr design, and there’s no reason to think that a burr designed to be universal, will outperform those carefully selected by the grinder engineering team and integrated as part of a specific grinder system (RPM, etc).
My interest in the WUG is a special instance as it does both conical and flat and therefore could serve as a platform specifically for burr comparisons.
Niche Duo and the Mazzer Philos do have my attention because each offer two burr selections that are optimized for different results within the same grinder system. This saves me a lot of time, money and gear-thought leaving more of all for coffee.