let’s not confuse generalities with specifics:
-- sure sub swarms of 3-4-5 subs work well, but in the op’s 11x13 room it might just be overkill...
-- someone who hasn’t heard maggies with subs well integrated, well they simply haven’t heard this... doesn’t mean it can’t be done... many here, including myself, have done it (myself many times in own and friend's systems)
let’s also not confuse 'something won't work' with 'some folks just aren't able to make something work properly" -- there is know how, and effort, involved in many aspects of this pursuit -- getting subs to work well with any top flight speaker is but one aspect... maggies are no exception, yes they are fast -- but are top wilsons focals magicos atc’s slow? don’t think so...