Additionally, optimizing for a particular identity might not only be counterproductive - it might actually be a quick way to get people to despise you.

Sure, but not optimizing for a particular identity can easily be just as harmful. This goes especially for social situations; consider being gay and not optimizing for a non-gay facade in an emphatically anti-gay environment.

Given that, the obvious follow-up question is how to tell the good identities from the bad, and I think the post does well in identifying some of the bad types. This, for example:

Synthesizing these three pieces of information leads me to believe that the worst thing you can possibly do for your akrasia is to tie your success and productivity to your sense of identity/self-worth, especially if you're using negative motivation to do so, and especially if you suffer or have recently suffered from depression or low-self esteem.

...seems well on the mark and I see a lot of myself in it. Could do without the superlative ("The worst thing you can possibly do!"), but otherwise it seems sound.