You are who you are so much more due to your own peculiar genetic inheritance, and this is what eventually prevails.
There was a longitudinal study I read a number of years ago that tested the idea that we all have inborn "happiness setpoints". These people in the study were followed through 20-25 years and periodically examined as regards their self-reported measures of happiness. The finding was that no matter what happened either positively or negatively in their lives, within 8-12 weeks they were universally back to their baseline.
This means a couple of things:
If you left the Borg in a dramatic fashion, within 8-12 weeks of adjustment you'd be pretty much as happy as you've ever been.
Too, for many here I imagine that the only thing the constant grating contact with the Borg could do is force you remain chronically BELOW your natural set point.
The deciding factor on staying or leaving then should be a matter of what you want. (but don't imagine that leaving will ratchet you to higher levels of happiness than those you'd ever felt periodically in the Borg) For me, the constant boredom, petty annoyances and tiny minds that predominated the KH made it clear to me that no possible meeting of the minds could ever occur and moreover those who were there were either not interested, capable or felt at liberty to discuss openly the things I had a real hunger for discussing.
Leaving the Borg, was like taking the weight vest off and running. My blood pressure has gone down, I feel more compassion for others and I feel like the usual crabby-non-depressed-aggressive person that I was born to be.
If someone of my former associates decide they want to leave the cess-pool, then I'd be glad to talk to them, but until then, for me they're just toxic association.