Uber app USED to be more convenient than the taxis that had to be called. However the companies have caught up, nearly every European taxi company has their own app. Additionally, not even Uber can beat the ease of just hailing a cab or walking into a cab on the street.
Oh, and they are losing money because of platform competition, nothing else. That she only reason a market is making a loss for Uber, because of price/driver bonus war. I can go more in-depth into this if you want.