Earlier quoted context omitted.
"recent years"? This guy has always been like this, going all the way back to ios hacking days or even wii hacking days.
I used to talk to him on one of those IRC networks for iOS hacking, forgot the name, but a good old friend of mine was involved in the scene, so I dropped in. He is definitely a skilled individual, but he lacks the key thing I think all true senior engineers need: humility. Without humility you're going to find yourself bikeshedding and wasting time and effort on things that may actually not be attainable within your…
Just a note on humility: some people are taught it from childhood. Enough failures mixed with the steady hand of support renders humility (usually). If you have too many failures where you're the only one picking yourself back up it can render a non-humility that can get you where you need to go but in the long term is not very useful. Colloquially I believe this is reflected as having a chip on your shoulder. There's also lots of early success where failures are just forgotten, smoothed over, or not learned from that can render another form of non-humility. People in the latter situations can learn humility at adulthood but it probably takes other people, who are very patient, to help get someone there. I personally have at times worn the chip on my shoulder despite not needing it anymore and can attest it's difficult, but worthwhile, to shake.