Especially compared to home terrariums for many people who keep large lizards , ingame it's large enough for most uses even too large for many animals. Too large isn't a phrase I would use often when describing an animals habitat, but the yellow anaconda and iguanas don't look big in the exhibit. If we were to get maybe monitor lizards or a reticulated python then I see the argument.
I think the main issue is basing a stance on a breeding exhibit where exhibits are obviously overwhelmed on the space factor for our larger animals but I can't say since I never have more than 3 animals in a exhibit at once (excluding insects).