Yup.

The region where the acoustical performance of the space is mode dominated is bounded by the first mode of the space where f=.5C/RLD up to highest where f=3C/RSD. This is where RTA will lie to you, EQ can't help you, absorption is really your only weapon and your ears are your best tool.

Above and below this region RTA is an effective and efficient tool for individual driver and channel level setting and more. Knowing it's limitations is the key to getting good results, same with EQ, especially an auto EQ system.