Ok, I finally thought about that thing I should have thought about for a month or five. And I sent the email.
After enough thinking it's a five-line email and a proposed minimal change in the application. Without the thinking it would have been a huge change.
The best code to maintain is the code that never got written. I am happy with my workday and will go home a few minutes early.
It's a boulder off my back and I am sighing of relief.