I don't see in your blogpost any sources cited regarding anyone saying that ES modules were infeasible.

Additionally, io.js actually forked off due to internal drama which started with Ben Noordhuis having changed some pronouns here and there and people wanting to cancel him for that, to which he picked up his toys and left the sandbox.

It so happened that aside from being competent himself, he had competent people on his side, which eventually forced those governing Node.js to concede.

Bun is just a cash grab in comparison.