Is it really impossible to have a cascaded FOLDER-ONLY menu pinned to the taskbar?

My philosophy is to use the taskbar as the start point for everything.
o I've been successful limiting the privacy-leaking damage from Cortana
o I've been successful with organizing (right-side) orthodox tile menus
o I've been successful with populating (left-side) heterodox alphabeticals
o I've been super successful organizing the pinned "Quick Launch"
o I've been successful with pinning frequently-used programs (everyone has)
o I've been super successful adding a WinXP-style cascaded shortcut menu
o I've been successful adding lesser-used shortcuts (in pinned "Favorites")
o I've been successful limiting the "notifications" to a bare minimum
o I've been successful in eliminating the "action center" callouts
etc.

The one thing I haven't yet figured out how to do with the taskbar is how
to make it do a waterfall-style cascade to a menu system of just folders.

Apparently, from my experiments, the only way to waterfall cascade from the
taskbar to any of the key desired folders, is to use the "actual" folders
(and not a facsimile, or shortcut, to those folders), which is ridiculous
(IMHO).

So that's the only thing missing in making the taskbar the *start* point
for *everything* that I initiate on the Windows 10 desktop.

I open this thread in the hopes that there is some devilishly clever way to
cascade "folders", so that, for example, if I want to open this folder
menu folder 1 folder 2 folder 3 folder 4 (open)

To be clear, I don't want _all_ the folders in that pinned cascade!

I want just the folders that I use the most pinned to that cascade.
(And no, it doesn't count to have a _flat_ list of pinned folders!)

It has to be an active waterfall-style *cascade*.
Is that possible?

Is it impossible to have a cascaded FOLDER-ONLY menu pinned to the taskbar?
Or, is there a clever way?

--
If you don't comprehend the problem, you'll likely have a lot of "googled
solutions", where, these solutions have to actually work to be of any value
(i.e., imaginary solutions abound for every stated problem set).