One fun paranoid thought I ponder over when getting a domain: What if someone with a lot of money and a distaste for what I write decides to buy the .com version of my site and post ugly photos of me to it? For me, I’d rather obviate that and just find an adequate .com.

Something brandable is worth holding on to IMO, especially if it's distinctive enough to trademark which likely means there isn't a lot of search competition either.