Plus the adaptor adds the better part of an inch to the assembly, which often makes the difference in whether you can get it to the bolt or not.
This really isn't a problem.
The only place on high end road bikes where that may be an issue is the rear fixing bolt.'
Loads of basic 1/4" drive "bike specific" torque wrenches are available for about $50 MSRP. You'll need two wrenches, usually for the 0-20'ish NM and 20 - 60nm.