To each their own. I'll take the chaotic, decentralised bazaar over the monolithic cathedral. I've been burned by all in or bust platforms before.

Meteor is emphatically NOT all-in-or-bust.

It has a JavaScript framework (Blaze), but also works with Angular or React.

It's tied to Mongo, but this release announcement is about loosening that bond.

To be fair to the GP, this view-layer-independence is very new, only officially supported since summer. Very reasonable to see it as all-in looking any time before.