I bought a 2018 Ridgeline and Honda kept the 'channel' in the cab for the rear seat legs. This reduces the benefit of stowing the seats up for cargo space or, in my case a large dog compartment. The channel makes it awkward for cargo and canines alike -- and you're right. It is totally unnecessary. Very unlike Honda too hamper the vehicles utility to compensate for sloppy engineering. The rear of Honda's channel is talker than the front making it more of a challenge to build a flat surface for cargo.