All I'm looking for is one of:

- you didn't meet our (technical) expectations

- we cannot meet your expectations

- you're qualified but we cannot pay that much

- you're generally qualified, but we need a Foo Expert today

The common letter one gets is "we chose somebody else who is a better fit". Sure, but what exactly fit better?

I don't think this is too much to ask for. Even that kind of feedback is non-existent, and I'm off wondering whether it's one of those or some remark I made or something else.

The most honest feedback I got was in small shops which didn't put an HR department between me and the CTO/CEO.