everyone that brightens these darker shades makes it look jagged and ugly. You cannot simply cut out a range of values and expect the old shadows to work, youll have to completely repixel the areas now just to make them look pretty much like they did before. also, each edit that brightens it just ends up with a ton of values in the mid-gray region, which makes it look even muddier. i say keep them, because the alternative is not attractive, and if you were to change any ramp to be a significantly brighter color, you will want those shades to help you out.