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Only you care about your definition of 'suboptimal'. Pro, amatuer and casual camera users are increasingly using phones instead of pro-compacts as production and usage stats show.
I receive iPhone files alongside D4 / 5D files regularly from the same professional photographers and have no problem preparing them for 300dpi print. These are pros who would have carried a GR1, GRD or similar and now use their phones.
Pointing out that many people use something that is suboptimal for a given purpose doesn't make it magically optimal. It just means that most people don't care enough to use something better.