I interned for Sun and then worked as an MTS in Sun Labs for a couple of years. I miss Sun; I think they were very much an engineer's company that was spoiled by two things: big success in the early workstation market, and the dumb luck of the dot com boom. Sun hardware was solid (even though they fell behind the curve because of mismanagement of a couple of CPU lines), and its kernel (Solaris) was one of the well-engineered kernels ever. While any business makes some bad business decisions from time to time, one thing that was fatal was a crippling enterprise focus that failed to understand the huge growth opportunity that OSS and Linux represented. It was growth in a direction they not only didn't understand, but refused to understand, study, or adapt to.

Sun's heyday was in the boom. The fish were jumping in the boat. So naturally they were building bigger and bigger boats.

There was always the one-off ideas that might have gone here or there, but that core server cow just seemed like an endless source of cash. Thus they neglected the workstation market and ironically, the market for anything bigger than one single server rack. They didn't understand horizontal scaling, and the rise of cheap-but-replaceable consumer hardware like how Google did things was alien to them. They poo-poo'ed Linux, they killed and then unkilled Solaris x86, and a number of other things.

I do miss Sun though. As far as engineering goes, they were a very serious company full of serious engineers. Basically the polar opposite of 10X tech bros and startup culture.