mettelus
Bottom line, with a DAW tools abound, yet I would urge you to place focus on your natural voice and bring it to the fore of music you create.
True, but there's a lot you can do to the sounds that aren't in the fore. For example when doing background vocals I often change the formant so my voice has a different timbre. It's still my voice and my expressiveness, but it "opens up" the background vocals so they don't fall into the same range as the lead vocal.
The other advantage of knowing "fix it" tools well is so that if a vocal is really, really good except for some glitch, you can fix just that one glitch.
When pitch correction is used to correct for lousy pitch, it usually doesn't end well, for all the reasons you describe. But it can be a very exciting creative tool.