I wasn't criticising you for the suggestion, merely expression frustration/confusion as why we don't have this in LFS yet, after all those years.
I cannot see any technical complications at all. You just need a multiline textbox to enter the notes and save whatever the user entered at the end of the setup file.
If the user is given a very generous 3500 chars to store info, then the setup file still wouldn't need more than 4kb on the disk (considering a default cluster size of 4k) so disk space preservation clearly isn't an issue. Sending setups cannot possibly be a problem either, since for example downloaded skins have an about 1000 times bigger size than a setup file right now. Just within a few seconds of being connected you have more data transfer than these meagre 4K, and you could still simply omit the note text if including it in the sent setup is for whatever reason not wanted.
I have honestly no idea why this isn't implemented yet. Maybe Scawen just doesn't see how useful it would be.