Are there not situations where a learned model could be insufficient due to lack of real-time learning? It is my understanding that a lot of current applicatio

Are there not situations where a learned model could be insufficient due to lack of real-time learning? It is my understanding that a lot of current applications take a ton of training time / computing power and it's not so trivial to do in the moment. I guess this is less of a theoretical problem and more of a practical problem though.