They are scouts . . . scouts generally avoid being fired on. They along with the standard GDL suit had extra sensors afaik that do not make much of a impact on TT game. For strategic purposes they are still excellent suits . . . just not cut out for stand up battles, its not their arena.
For me at one point, in built up terrain I loved them b/c they were extremely mobile for a very low BV to make leg attacks . . . which just runs counter to what I said, lol.