I almost always use CIELAB as a working color space for photographic work (my action linked previously converts to 16 bit/channel CIELAB space as its first step

I almost always use CIELAB as a working color space for photographic work (my action linked previously converts to 16 bit/channel CIELAB space as its first step, though you could use a similar type of tool in RGB mode if you wanted to). But I have a pretty good idea of the final RGB (or other) gamut I am aiming for. Photoshop is definitely designed RGB-first, and some of the tools get a bit clunky in CIELAB mode. It is still an improvement for most of what I want to do. I have many ideas for better image color manipulation tools.