I wish they made these an add-on.
Until then, I expect to hear my fancy files are "broken."
Even more conservative organisations will often be running Office 365 with a lag, still getting features after ~6 months.
If you need 100% compatibility that will always take a while, and I'm sure some big enterprises are on old style office. But it seems like the vast majority of small/medium business is on the Office 365 juggernaut now.
While these new features seem exciting, I don't expect to use them anytime soon if I'm planning on sharing my work with others because it's not that easy tracking down which features are tied to specific Excel releases.
I do not send spreadsheets anymore and just send a onedrive view only link to whoever needs to see it.
On the chance they need to manipulate I share the edit link (which has version control) and my stress levels are minimal.
Also seems difficult to maintain if these are cell-bound, and both the cell edition interface and the Name Manager interface were an incredibly poor edition experience from what I remember, but maybe that improved since?