For comparison, here is my largest plant (12" pot/10" deep) from above and from the side (after harvesting at least 20 offsets this season). I have tried small(ish) pots (like 6-8") and the plant does okay, but it gets frustrated after a while, tends to have a short lifespan, never reaches anywhere near its full potential size, does not offset like this.
As with many succulents, lots of people underpot them unknowingly and end up with plants they can be perfectly satisfied with, but a bit of extra space will get you a crazy profusion of arms and new heads, and a pretty spectacular show in bloom.
