Before moving out of concentrics and into eccentrics, I asked this question previously. Does concentric only training afford any advantages over other training? Did anything come to mind? Hopefully if you've been reading the posts, then the utility of concentrics for developing the contractile component of muscle and training concentric dominant sports such as cycling, rowing and the like, would have become clearer.
Rounding back to this contractile component, one of the interesting adaptations to concentrics seems to be more muscle growth/hypertrophy associated with the medial region of a muscle, whereas eccentrics can lead to more distal hypertrophy. This has interesting applications for clinicians and strength and conditioning coaches. Your integration of contraction type with exercise selection can drive selective hypertrophy of muscle i.e. better injury resistance, rehab and sporting performance.