A consumer might not care about profit margins per se, but a producer will. Hence why most money-making apps are built for iOS first before being ported over to the less-profitable Android.

An incentive structure like that means that the Apple ecosystem will typically have the first-and-best development support.

That is why a consumer might care.

Unprofitable companies historically become unviable options.

Profit can be a measure of quality, assuming an efficient market.

A company is incentivized to keep supporting a product that is profitable.

They shouldn't. This was a business analysis. Apple doesn't want to have 70% of market share, they want 90% of profits.

Apple and Samsung are the only companies making a profit selling mobile phones, and apple makes vastly more profits than samsung does, with a much smaller fraction of the market share.