Hehe the problem is that I don't find battles vs AI challenging... it could be fun of course and that is the reason we play CoH - to have fun, but it's not challenge for me. Challenge is only when I play vs humans.
And AI does sometimes figure out how to break barbwire, following examples I have seen personally when compstomping:
- PC use engineers to cut the barbwire
- PC use Mortar barrage to destroy barbwire
- PC running through barb+tanktraps with heavy armor and crush it
- PC is shooting with every barrel like dumbass into barbwire and eventually breaks one hole into it
- PC throwing Satchel charges into barbwire to break it
So it's not like guaranteed victory vs Expert AI - just to build barbwire. But if you do that it is quite effective. You have to use some skill too.
And btw it works to some point also vs human players, at least you delay his capping because most of the players cap with Shift+move order in the rush of battle and don't check how they cap, so after some period he figure out that his capping unit is standing next to barbwire and doing nothing