@wowgetoffyourcellphone is the leader of the mod.
I have nothing to do with this decision, but if I can bring some info to help discuss this topic:
"The overall size of the Roman forces in Roman Britain grew from about 40,000 in the mid 1st century AD to a maximum of about 55,000 in the mid 2nd century.[1] The proportion of auxiliaries in Britain grew from about 50% before 69 AD to over 70% in c. 150 AD. By the mid-2nd century, there were about 70 auxiliary regiments in Britain, for a total of over 40,000 men. These outnumbered the 16,500 legionaries in Britain (three Roman legions) by 2.5 to 1.[2] This was the greatest concentration of auxilia in any single province of the Roman Empire. It implies major continuing security problems; this is supported by the (thin) historical evidence. After Agricola, the following emperors conducted major military operations in Britain: Hadrian, Antoninus Pius, Constantius I, and Septimius Severus."
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"By the 2nd century, the Auxilia contained the same number of infantry as the legions and, in addition, provided almost all of the Roman army's cavalry (especially light cavalry and archers) and more specialised troops. The auxilia thus represented three-fifths of Rome's regular land forces at that time. Like their legionary counterparts, auxiliary recruits were mostly volunteers, not conscripts."
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"Recruitment was thus heavy throughout the Augustan period, with a steady increase in the number of units formed. By AD 23, the Roman historian Tacitus records that there were roughly the same numbers of auxiliaries in service as there were legionaries.[24] Since at this time there were 25 legions of c. 5,000 men each, the Auxilia thus amounted to c. 125,000 men, implying c. 250 auxiliary regiments.[25]"
This is simply from different articles on wikipedia.