Gadol +1. hashem even asked an elderly man to climba (small) mountain for a long Torah lecture. This week, Moshe was trying to give a dvar Torah in between some stones! There are also Navvim, such as Eliahu, davening outside even in bad weather! And Avraham was meeting Hashem outside the tent. And Rivka fell of the camel seeing Yitzhak davening outside. And Yaakov did not stay at King David.
In fairness, there was a tent and a cloud above. And we don’t know that Jews davened outside. Maybe they had shtible tents.