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The best games were coded in Assembly.

Pokémon Red and Blue
Roller Coaster Tycoon

Yes.

Code vanilla and you know how it works.

Rely on other people's bullshit and you have far more points of failure.

iT's A cOmPiLiNg PrObLeM!!1

Isn't the framework an effort to assist outsiders to understand, inspect, and troubleshoot code that they didn't design, or help develop?

The only downside I can see is that using generic core libraries across multiple systems would increase vulnerabilities if one of them is hackable.