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

[longpanda]

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