yeah the flexplates are a weak point imho in ford ecoboost powertrains, but more so in the 2.0 or smaller configurations. seen enough go kablooey on 2015-2018 Edge vehicles with the 2.0.
i remember when i upgraded to a fidanza flywheel on the 92 mtx SHO. what a difference!
hopefully they are making billet or better lightweight aftermarket flexplates now.
the list can still be used for companies that might be interested in making stuff for your X-ST. their work is proven on the Edge Sport platform.