Why is it Ventoy is so particular about it's VTOUEFI Partition?

[Rootman]

Yes.
The partition layout is part of Ventoy core solution.
Ventoy partition layout check is very strict. You can not adjust partition layout manually.

If you want to adjust the partition layout, you can do as follows:
1. delete VTOYEFI partition.
2. Adjust other partitions as you want. Only that you need to leave at least 32MB free space after the 1st Ventoy partition.
3. Use Ventoy non-destructive Installation
https://www.ventoy.net/en/doc_non_destructive.html

Thanks for the explanation.  Can you comment on WHY this is so with more detail?  I know other apps and even Windows EFI boot partitions are not as sensitive.  I know that Easy2Boot supplies a modified version of Ventoy and is not sensitive to this, so it appears it is not strictly necessary.