Pretty much irrelevant though. You wouldn't write a mapping app that used just one mapping back end these days so you'd probably abstract that anyway so you could switch datasets.

Most of the problem I have with OSM seems to be the really awful apps that use it compared to the commercial offerings. HERE and Google maps win because their apps are pretty good with generally well thought out UI. Compare them to OSMAnd, often the poster boy for OSM but perhaps one of the worst UIs I've ever come across in the entire history of apps. I've got mapping apps written for MSDOS that are more intuitive.