Package: debian-installer
Version: Buster, debian-testing-amd64-DVD-1.iso, downloaded 2019-03-16
I hope the installer could be a little more flexible in regards to EFI partition, or is it because it require a SWAP partition, haven't been able to point down the problem. Can only make a successful installation using automatic.
Why put a size limit which is way larger than the technical limit?
This is Linux, not Apple or Windows!
I believe you can install grub2 on a 5MB FAT16 partition if you prefer.
But the installer absolutely want a very big partition.
There might be a technical reason, but I assume is just a matter of opinion, right?
It fine it give a warning, but please let the user decide what to do. He know what is best for him, not you. It is a very paternalistic attitude and very far from the Linux spirit.