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2 engines of the type that they put on 4 engine planes are less reliable than 2 ETOPS-certified engines. ETOPS-certified engines (actually engine, airframe, airline combination) are going to be more expensive than engines where you have three extras next to them.

I could build a jet engine in my garage and the FAA wouldn't let me fly 270 minutes away from an airport with paying passengers on it just because I made four of them. Certification is always going to be important.

I'm genuinely baffled at how you're going back and forth between authoritatively talking about how ETOPS is definitely scary, unsafe and new, but you also clearly know nothing about it.

Why not research a thing BEFORE deciding you have a strong opinion about it?

That’s not a reasonable conclusion. The 787-8 and 747-8 are both ETOPS-330 certified.