What is TOO big for a ball python terrarium?

[Neal]

If you can keep proper temps/humidity there's no such thing as too big as long as it's properly cluttered and has plenty of hides. I'd say more than 4x2 is overkill but if you can keep the conditions right and keep the snek feeling secure there's no such thing as too big. I'd say the large low would be the best size

False. There is such a thing as too big. That results in you having to buy unnecessary things to make the cage cluttered, or purchasing additional hides. Not to mention it requires more bedding unless you use newspaper/paper towels. Also with more cage clutter comes more cleaning.