It’s not a matter of familiarity.
I can place an order in the Chick-fil-A app in about 10-20 seconds. Quick and easy.
A similar order in the McDonalds app throws up ads, unskippable animations in time sensitive spots, unresponsive or jumpy UI elements, popup alerts several times, unnecessary steps (like how the fries category has one item, but it still shows you the list view), etc.
I’ve wound up parked in the lot cursing at the app a number of times as I tap through obstacles.