As nice as an HSTS preload list is, using .app and .dev for this is infuriating.
Thanks for wasting about 6 hours of my time a few months ago by forcing me to change all my non-https local DNS entries to something other than .app and .dev, and then dealing with various flow on repercussions.
Really helpful that was. Especially the latter. How many decades of man hours are you wasting from this I wonder...