Minecraft was (is) the most successful moddable game of all time so you bringing it up as a negative example makes no sense at all.
just piping in on phantos' behalf here - the issue he brought up is not that a game that had terrible mod support tacked on as an afterthought/mod support completed way after release can't be successful, but that it takes years (nearly a decade for mc) for modding support to actually be fully integrated when treated as a "feature" of a game rather than as the foundation of it.
im guessing the difference you missed is "lets make a game with modding support" vs "lets make a game using the modding framework we developed". the first will take a lot longer to reach full moddability state while the second is moddable out of the gate. there's definitely downsides with the second approach (much harder to add core features, optimize engine, etc once the modding system is locked in), but the foundation of moddability is how BL has always worked and attracted developers despite how stuff the engine is, so you should keep that in mind.