Don't blame german engineers.
Torx was invented by an american company (Acument intellectual Properties LLC.)- you have a license to produce the proper tools for torx application. No license - no tools according to spec.
Most of them fit very badly because they are not made to specs for a reason, otherwise you have to pay fines..
Get some Hazet, GEDORE or Snap-On tools- they still have the license and they do work perfectly.
The reason was as already mentioned the higher applicable torque ratings- and mountable with machines.
and guess what- Mercedes uses exclusively Hazet tools... You can buy complete basic sets for Mercedes and Jeep applications. very affordable