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Reliablity vs unreliable service at IP and Link Layer

Last updated on December 27, 2018

        I am taking about the 5 layer model. It is well documented that TCP is a reliable service and IP is best-effort delivery and hence unreliable (ref <a href="" rel="nofollow">RFC 792 - TCP</a>).  Also, the data link layer is 'reliable' because of its ARQ mechanism guaranteeing sequential delivery of packets (<a href="" rel="nofollow">ref</a>).
I cannot make sense of sending packets of reliable service (TCP) on a lower unreliable service (IP) which in turn sends packets on a layer which provides reliability (Link Layer). Why can't we do away with reliability at link layer as IP is unreliable?

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