After you've edited your question and complementary to what DL wrote, I will answer the
Is the information extracted from the ASTERIX messages useful for the
Controller to conduct his work?
No in the modern ATC-ATM system it's not. I will consider the "regular" ATCO and not other supportive (but equally important) positions like for example flow controllers that need supplementary systems. So an executive ATCO will need:
- Flight data processing. Including complex tasks like trajectory prediction, time estimation etc
- Radar data processing. Part of it is the ASTERIX data parsing
- Safety nets. That is STCA, MTCD, MSAW, RAM, CLAM and maybe I've missed something. See below for explanations
- Weather data. For obvious reasons.
- Current AIRAC information. Airways, fixes, navaids, sectors, military areas, coastline, the whole nine yards.
- Voice communications. With complex functionality like recording and frequency coupling.
- Fusion of all the above in a nice application and UI, usually called CWP. It's the "RADAR screen" that provides the controller with the current situation, and allows them to provide input and change a flight's status. Pretty complex and demanding application.
As you can see, and as I've already commented, ASTERIX parser is a small chip of a bigger mosaic.
STCA: Short Term Conflict Alert. The most important I would dare to say. If there is an outage, you might find yourself with a ticket on hand but unable to fly for several hours.
MTCD: Medium Term Conflict Detection.
MSAW: Minimum Safe Altitude Warning.
RAM: Route Adherence Monitoring.
CLAM: Cleared Level Adherence Monitoring.