MIRI also suffered from some degree of echo-chamberism, founder-effect-bias, insufficient engagement with prior research (due to hubris)
MIRI had a lot of "not invented here" mindset. It was pointed out, e.g. [here](https://web.archive.org/web/20170918044233/http://files.openphilanthropy.org/files/Grants/MIRI/consolidated_public_reviews.pdf) but unfortunately the mindset is self-reinforcing so there wasn't much to be done.
MIRI had a lot of "not invented here" mindset. It was pointed out, e.g. [here](https://web.archive.org/web/20170918044233/http://files.openphilanthropy.org/files/Grants/MIRI/consolidated_public_reviews.pdf) but unfortunately the mindset is self-reinforcing so there wasn't much to be done.