User blog comment:Derax-Pagani/Fairy Tail Chapter 494: The Hill Extending Towards Tomorrow Review/@comment-6401212-20160717094147/@comment-4829046-20160718095313

To be fair, Mashima has only added varying unit types into armies in FT merely for convenience. The Legions in Edolas for example, were necessary for the setting. In practically every battle, the fodder have mostly been copy-paste so that we don't have to actually think about the war aspect too much and just watch the named characters show off their strengths. If it were a proper thing, Mashima would have pulled a fantasy battle route, where it is a mix of all sorts of dangerous beings rather than faceless people in uniforms.

Most likely Wahl being a Machias is supposed to be his unique quirk and thus having more of the similar type appear would basically stomp on his character. They'd all be Cyborgs so the only thing you can really change is the weapon settings they possess and Wahl(and his puppets) covered most weapon settings already. Basically any other Machias would only be minor shock value at best and will be wiped out much sooner than Wahl's creations were. If Dragon Ball has taught us anything, the first Robot is always the deadliest robot. In that case, I'd rather not watch more getting trashed for the sake of visual aesthetic.