Well, thatīs not the whole truth. It is right, Lufthansa and their partners let you do the DLR. But there are still companys in Germany woh donīt require it. E.G. AirBerlin, DBA, LTU, (they have a Test at Intercockpit, pritty much like the Dlr, but you can do it again after a while), Cirrus, DCA, all the executive companys, Tuifly (DLR only for their flightschool), Germania. Condor still have the DLR, but it seems, they might change that.
And it is not true that you canīt redo the Test for Lufthansa. First you can try it for their flighttraining. If you fail, you can redo it for their ready entry programm.
You see, not all german pilots have DLR. I even know more pilot who havnīt and still they fly. I would even guess, that more than 50% of the german pilots failed or never tried the test. Well, Lufthansa flight training surely is the most secure way into the cockpit in germany as they garantee you a job (if not, they repay the loan), but definitely not the only way.