I prefer to have more room than most shanties supply. I drill an extra hole for my graph (Fishingbuddy) and like to spread out. Now I will need 4 holes with the 3 rod rule. I have a 9" Power Lazer so the little trap door they have in the floor of those things won't handle 3 big holes.
I have put plenty of miles on that shanty over the years - just prefer to fish outside if the conditions allow now. Warmth is for wimps!!
Really - I have upgraded on my boots and clothes so I can handle being outside (except for hands!). Last year I was out one time and literally had inches of snow accumulating on me and didn't even care! Plus when you are outside you can see what is going on with everybody else. Plus it is much easier to get up and walk around and stretch outside rather than having to pull lines, unzip the shanty door, put your jacket back on, etc.....