I see.No goal, just a temporary alternative to customise the Accessibility's prefpane "reduce transparency" saving some blurs around.
But, when you de-activated the vibrancy onto the Finder top menu bar, does its dropdown menus still preserve vibrancy ?
I believe the Finder drop-down menu vibrancy is inherited from Appkit and not from HIToolbox, but I could get wrong.
If so then no matter a solid black top menu bar in dark mode, I mean even on Metal GPU that's scarcely noticeable.
No, menu bar items are also solid (yes I sacrificed the menu for fewer tweaks just to get by...)
HIToolBox controls a lot. AppKit can override from the app. Choose your weapon.