That is my point.
> What it can run on doesn't really matter here.
It does because if it were a rich, (too) demanding layer 3 then it would not have been able to go through any network technology. This is explained all across the literature. Googling for 2 minutes already finds one instance:
¨By offering an unreliable asynchronous packet delivery service, or datagram service, IP assumed a lowest common denominator of network functionality, and maximized the number of different types of networks that IP could utilize.¨
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