Such units have to be charged of multiple units, get disrupted on flank/rear and so on. No carnosaur alone can’t do it
Watched MMM last night battle report of dark elves vs lizardmen. It was a bit painful with not a lot of combat as the elves preferred to shoot and the lizards used templates to block while advancing and not wanting to charge (spears which can't fight in the second row on a charge and the elves with an init meaning they are striking first anyway) The big takeaway, aside from boring tactics, is the concept that a caster can dispel a template if they are with range of the opposing caster, not template. The tactic of laying down clever templates and staying out of range of a decent dispel was an interesting one, it seemed to work quite well