"Things may be different"
First I realize that with modern variable speed compressors, now you can change system capacity
But around here we have cold weather!! An example of that is say, a small business with lots of "sun" exposure, and a high indoor heat load. Lights, maybe copy equipment etc, and or lots of people. BUT on cooler days when the ID load wants AC it might be a sunny 40-45F day OUTSIDE. "Back then" a "high" sized system will just tend to ice up under those conditions.
You want to be careful over-sizing, you can create a clammy interior
