Development is decentralized by nature because it's open-source -- anyone is free to fork the code.

I believe I argued before that development focused on Core is natural as well, as it represents some kind of a natural monopoly, where it is more effective to point resources at one implementation; the 'decentralization' as you are suggesting is in fact associated with wasting resources.

The only reason these multiple implementations can exist is when Core can't deliver a particular feature for technical or ideological reasons, and thus this wasting of resources is justified. But unless the market really wants this feature, the Core will stay a monopoly, no matter how many GIFs you create, it's simply more effective resource-wise.