One does not preclude the other, it is only a matter of distribution, like the mainframes taught us eons ago, by combining JIT/AOT on their toolchains.

The fact that Oracle, Microsoft, Google and Apple are now on the JIT/AOT train, tells it all.

To be fair, .NET always had AOT native compilation support from the early days, but NGEN is a simple AOT compiler only meant for faster startup.