That dismissing the concerns of organizations, big and small, that have contributed to Ruby's success is intellectually dishonest.

Which organizations that you mentioned (Heroku, Shopify, Basecamp, Github, 37 Signals) have been dismissed? This post seems focused on Ruby Together & Ruby Central and struggles within.

I'm having trouble finding a specific meaning here. Has some concern been dismissed? By who?

I think you are spot on here, although many may not like to acknowledge it.