I read and disagreed. As before, regulars are more than up to the task of holding the line, especially since I never have captain-led stacks and aren't careless with my generals. More to the point, two units of regulars will do a better job of it than one elite. I'd rather have two units of Hoplitai than one of Hypaspistai (or for that matter a unit of decent cavalry - more cavalry is better for flexibility). That's more tactical flexibility. Furthermore, they're recruitable all over the place, and replacable with an identical unit of mercenaries, who are again available all over.

You can see my army above, I never use a full stack, so it's not as if I'm short of space.
except that 2 dont always do a better job than 1. due to better morale, 1 elite can tie down enemy armies for longer in some cases than 2 regulars ever could. due to better endurance they can wear down the enemy longer on the flank in some cases than 2 regulars. etc. this is my experience atleast, and if you disagree, i guess thats where the discussion ends.

You didn't put regulars against elites. So this is all meaningless and tells us nothing. The AI doesn't field armies comprised mostly of levies, most players don't use armies comprised mostly of levies.
sigh, you dont get the concept of cost-effectiveness.