The same origin model makes data crossing origins rare and scary, which leads to centralization.

Tools like Information Flow Control, if applied in clever ways, could allow common and safe data crossing origins.

But it would require all data in the system to be tagged, and for the laws of physics around tags to consistently enforce only legal tag operations.

This would require a whole new universe of software to be created.

How could you possibly get critical mass?

If only there were a system for generating a swarm of good enough building blocks, and it could be made joyful to incrementally extend those building blocks…