This is really a loaded question because you're comparing the camera to you but wording it as the camera vs lightroom.
A skilled and proficient user at Post Processing will have much finer control and therefore be able to consistently get better results doing it themselves. None of us know your skill level with Lightroom to know if that applies to you or not.
And then when you start asking about time it gets even more complicated because even if you know how to use lightroom to get better results do you know it well enough to do it fast? And by that I mean fast enough to be profitable? Or are the results you get doing it by hand sufficiently better to charge a higher rate covering the added expense (similar to offering basic retouching vs premium retouching services)?
So to answer your questions:
Is it better that I keep these settings off and save the editing for Lightroom? Or can the camera do just as well or even better at making these adjustments? Am I wasting extra time editing things in Lightroom when my camera could've automatically done it just as well for me?
Depends on your skill and speed in Lightroom (or whatever Post processing suite for that matter)