You're right that decisions regarding frameworks are often made for largely arational reasons, but I'm baffled by the claim that these are not technical decisions (unless you're just joking?). If they're not, does that mean that in your model it's the PM who decides which web framework and database the team uses?

In any case, even if my example were a bad example for some reason, there are definitely lots of technical decisions that are fuzzy. How could there not be?