Crop to desired image aspect ratio is always an alternative. IMO, more important than image aspect ratio is being able to adjust the image composition to a given aspect ratio or being able to crop to a desired image aspect ratio.

This is more a matter of composition skills than image aspect ratio than aspect ratio alone. Second aspect to this, does the fixed aspect ratio become the image driving factor or the the image goals in mind or vision become the image goal's driving factor?

Bit of history:
https://www.scientificamerican.com/a...n-proportions/


Bernice