Maps & Gmail & Search all have plenty of accumulating flaws... but they also completely defined their product category and today are among the most popular software products ever made.
More than plenty of people (including me) would argue that Windows is an awful product, but a quite significant number of people (maybe even including me) would argue that its an outstanding product.
Wow I wonder why maps and gmail are extremely popular by the company that controls the largest browser, search, android, and advertising. It's based solely on their merits and not abusing their monopolistic position to thwart competition right?
Garmin was and is better than Google Maps and Mapquest was better than Google Maps when you needed to print directions. If Google didn’t have Android would maps matter as much?
Apple Maps and Waze is better for directions. Apple has better CarPlay integration and HUD. Google Maps is way better at searching for things like restaurants or local businesses but not as much the nav part.
"among the most popular" doesn't need either of those to be true.