Stacking The Beatles in Excel: An Exercise in 3D stacking

In an effort to turn my work into a generalized function, I'm coming to the conclusion a Lambda to stack and sort across a 3D sheet reference is not feasible.

My function checks successfully for:

- uniformity in column names in all sheets even if not in same order
- valid 3D reference
- the sheet where the function is used is not within the sheet stack
- row and column limits of Excel not exceeded by stack estimate (before dupes removed, filtering)

The main issue is Excel is incredibly shaky when stacking beyond 10,000+ rows across even 2 sheets.  Stacking 10,000 elements is quick at .25 seconds.  Doubling the rows leads to an immediate crash.  I think this stacking could be a bit more reliable without the multiple checks but if the function will accept any 3D stack without inspection (and fail) then there are smarter options.