It is so disappointing that basic filtering feature needs to be requested to be part of an analytics platform. Adding a comment in this thread hoping to be notified when someone from Adobe confirms this is available. The use of "If" statement (+ "and" for multiple conditions) is the only workaround

+1 on this request.

8 years later and I still feel the interface of processing rules is dated, the boxes are too small especially for Action > Concatenated values and not optimised for big screens.