Interesting, coz I had battle yesterday and it was completely different. I tried to raid an Aserai caravan composed mainly of archers, cav and horse archer. The enemy AI made the decision to hold the archer and cav while sending the horse archers to harass me in waves. When the HA took damage, the AI would pull it back and regroup before sending them to harass me again. Since I only had infantry and some archers(and I'm still trying to get the hang of the new system), I got destroyed. The point is tho, the combat is very different compared to the looters, sea raiders, steppe raiders, etc, that have I have fought.
That sounds promising, in one of my custom battles i have to admit archers did stay back and fire but it was the blob of infantry that just did the same thing over and over, charge with no strategy even if outnumbered