Photogs adapt to the medium. [1] provides a good insight into how Instagram's (initial) square-only format and low resolution are creative constraints themselves. I practice mostly street and photojournalism with some portraits (and also shoot, develop, and scan my own film) and story has always triumphed quality, and Instagram's limits are plenty.

[1] https://www.youtube.com/watch?v=JQWYEPNh8QE