The more I look at stuff and think about it, the more I think Yanfly's more quality of life plugins have been included in MZ. Things such as the core engine, auto save (leaks), the leaks also mention adding a clone class to JS objects. So I suspect either/both Event Spawner/Cloner being present. I admit I will be surprised if Self Variables/Self Switches doesn't make it.... It's a functionally present in every other serious/semi-serious engine.
But with Yanfly leaving the scene, the money left behind to make certain they're updated for future versions, and what's been said by important people in these threads... It only makes sense to have moved the "core functionality" plugins into MZ.
Just speculation though.
Also... Em-Zed..... Yeah that's never getting adopted stateside.
Yeah the light trail behind my character in my latest video is PIXI particles. But I don't think people really understand what can be done with them. It didn't take much to vastly improve performance and the look of my game (beyond the video) by simply remaking almost all of my graphics in PIXI particles.