I see photographs as one medium for art - and it's the art bit that's difficult, whether one's medium is paint, stone, silver gelatine prints or indeed words.
And some people (the vast majority, perhaps) simply don't have the ability to make really good art, to develop a style and a vision of their own that is distinctive and outstanding. This isn't to denigrate all those people (hardly, I am one myself) but just to acknowledge that some are gifted and most are not.
I don't believe any old person can become Edward Weston (or Marc Chagall or Barbara Hepworth or Mantegna or whoever) just by dint of studying hard for 15 minutes every day before breakfast for a year (or 10000 hours or whatever the latest fad is) ... or, you might be able to, if you have "the gift" latent within you
Again, to emphasise, this is not to denigrate anyone: I do believe anyone can produce something "artistic", sometimes with guidance, sometimes spontaneously, the question for me is about doing so consistently.