You do not have to know what cat tools are. Unless you are going to work as a translator. Here you learn all you need to work faster and more accurate.
Not every driver must be a racing driver. But every driver has to know how to drive a car. If you are going to work as translator you have to learn how to use all needed applications.
Professional translators never stop learning. They must be up to date. Always. We can support you with new informations and knowledge you need.