Thank you so much for information!! I know someone that advocates using a reptile fogger. To me, that is too much humidity and way over the top! These poor torts do live in the tropics!!
In an open topped dry enclosure in a dry heated or air-conditioned home, it might not be too much. Every situation is different. I prefer to prevent the loss of humidity rather than adding more all the time to try to compensate for lost humidity in a dry room. So while I prefer to use closed chambers, humidifiers are not necessarily bad in all situations.
And actually these tortoises DO live in the tropics. Sulcata territory actually straddles the Tropic of Cancer, so some of the native range is in and some out. Sulcata babies hatch during the monsoon season where it is hot, humid and rainy with puddles and marshes in abundance.