@Stevedo-6-0 Everything you posted above regarding the XT3 is factually correct. Literally every function is lightning fast. It's a game changer in the GPS world.
I was out on a ride yesterday, running a route on my XT3 and on MRA phone is parallel. While I had no major complaints about the MRA phone app, the XT3 off-route functionality was faster and more fluid. Despite the continuous improves to the MRA app, there are HW speed differences between a dedicated GPS and a phone app that can probably never be completely bridged.
Regardless, it does a disservice to the navigation community to try to push one product at the expense of others when the facts are just wrong. Hopefully, it was simply ignorance based on not knowing the current state of Garmin devices.