I tend not to care how warm a tent is since I can't rely on that when picking sleeping gear. Far more important to me are space and venting. And if a tent has good venting, it's by definition not going to be a warm.

The vestibule on our tunnel tent is massive but it's also not "sealed" so no floor etc.. We still prefer to keep our ortliebs open in the vestibule because that lets the bags air out and allows any residual moisture to evaporate. We sometimes find creepy crawlies but since we live in Europe none of them are dangerous.

But on that last point apparently the black widow spider has migrated to Sweden which I am extremely excited about. I need to go and try to find one at some point.