The reason the 2017 Acadia LIMITED does not have the push button start is because, unlike the other 2017 trims, the LIMITED is the previous, larger generation Acadia with the 3 seat 3rd row. The LIMITED was only produced in 2017. It is basically a 2016 Denali (it came very well loaded with options) sold as a 2017 MY. All other 2017's and later are the newer, smaller generation Acadias, with only 2 seat 3rd row, which have the push button start.
2016 Buick Enclave Premium AWD Ebony Twilight Metallic w/ Choccachino interior , 7 pass. , Sunroof and Trailering Package
2010 GMC Acadia SLT-; AWD; Quicksilver w/Ebony Leather, 7 pass. seating, Duel Sunroof, DVD, Nav.