The GNU project is wall-to-wall toxic waste, but I note for the record that I don't think sudo is a GNU program and IIRC it's not even GPL.
I'm not a fanboy for the sake of it, but you're being a little over your head here.
I don't mind expressing this opinion. There is nothing anywhere in the GNU project which should be emulated, except the license.
Unless it’s BSD, I guess?
And `ed` dates from 1969: https://en.wikipedia.org/wiki/Ed_(text_editor)
On the other side, I remember howtos/manuals/READMEs in the early '00s referring to su(1) and only sometimes saying "..these days you should be using sudo(8)", so it always felt like something "new" :)
The homepage for sudo is https://www.sudo.ws/
It is licensed under an ISC style license.