Am I the only one wondering when it stopped being one?

Always has been.

People keep saying this but I have never found it to be the case for me. I meet and collaborate with amazing engineers on Twitter, and often get help with tricky problems. I have also had a lot of success using it to spread the word about my own projects.

Agreed, Twitter when properly curated was very useful.

Your viewpoints were highly privileged on Twitter for a long time. When you're accustomed to privilege, equality feels like oppression.

Correct, it was always a dumpster fire. Now an entire landfill is on fire.

For at least 10 years.