We agree. Wary is the right word.
I guess I'm also not sure if decentralization guarantees spread. Bitcoin development for example remains centralized/specialized: one real implementation in use, a relatively small group of devs involved, etc. Even assuming Bitcoin is properly spread, Bitcoin is worth 250 trillion dollars in aggregate to many of us and participants have a fair shot at owning that appreciation/social good. No other technology might ever have these features.
While decentralized advancements are better, I'm less bearish on centralized advancements. If they are net bad, their head will be put on a pike for all to see. Perhaps not fast enough though.