You are probably being downvoted because your argument is based on cost, but the connection cost is higher than going off-grid in the aforementioned example and centralized grids are vulnerable to tail risks that are decentralized systems are not vulnerable to, i.e. it’s cheaper till it ain’t.

Here in ZA the economy got screwed because nobody was prepared for the centralized provider (Eskom) to go down, which it did because of corruption and race-based quotas (BEE) firing senior white staff. Centralized orgs centralize risk and corruption.