Of course you can "beat these people", around 65% of PIP and 70% of ESA appeals find in the claimants favor.
It just takes time, and the strength to keep plugging away at it.
It is a disgrace how long it takes, but that's mainly because the DWP keep getting things wrong so there are lots of appeals.
It's also costing the tribunal courts a fortune to correct the DWPs (sometimes deliberate) errors.