A few weeks ago I accidentally dropped my space grey MBP. It had the lip open and fell on its right corner, inner/keyboard side.

The machine is fine and I didn’t even have to adjust the screen as it was still correctly in place but on that corner the aluminium lifted up forming a mountain shape, about 2 mm tall and very sharp.

Not only this was uncomfortable, but it also meant I couldn’t close the lid properly and might eventually crack the screen from it, so I filed it away. Like OP, I started with a pretty gritty file to get most of the tip off, then finished with a multi-tool with the sanding attachment. I went through a few grits but I got bored long before it was smooth.

In the end, I actually liked the look, and have been considering going all around like OP. I may have to do it now.