Good adventures do.
What would be much more useful in a DMG or MM (probably DMG) would be one or more random tables of strategic goals and tactics. With stuff like "just passing through and will attempt to disengage with minimal casualties" or "defending a nearby breeding ground and will fight to the death" and so forth. Perhaps it is even there already --- I can't recall. The idea being that in a random encounter the DM can quickly make the encounter more interesting and can also use the results as inspiration for what opponents in non-random encounters might be doing.
This was what the old reactions table was for. if the DM got a "friendly" result for a group of goblins he would have to make a different interpretation than if he got a "hostile" result. maybe in the former case the goblins were being bullied by a bugbear and we willing to bribe adventurers to take him out and in the former case they had been ordered to bring the bugbear some treasure OR ELSE. In either case, there would be more to the encounter than "roll initiative."