I saw this in SunVox and thought it was a neat idea. It makes it a little clearer where everything starts and ends. Maybe the sample length could even get tied to it so that you could easily see how long one-shots are in the pattern editor.
It’s not a revolutionary idea, just kinda neat to have.
solution: Don’t think of it as “actual note length”, but just as “length until all notes in the column have reached a note off”. I would find that useful enough…