I have an unfinished back corner. It's a long reach requiring climbing on the layout so it has been waiting.
On the other hand- I've finished, ripped up, and refinished another spot several times.
This was early on after the base build
Then I added a fascia to the front edge and enhanced the scenery.
Then I blew up the whole thing and changed the elevated track to a short siding and building.
As the old saying goes... a layout is never done.