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The sooner this happens, the better for the player (if the ally is controlled by the AI, of course). Because then you can capture the former cities of the ally and use them for your own purposes. But you can't do this directly, according to the restrictions built into the rules. So, weakening the ally is in the player's interest if they are playing to win...
The benefit of having an ally is small - they reveal the map and visit obelisks, which, if I'm not mistaken, also become "visited" for you (but you can do this yourself if you recruit heroes in the ally's castles)... So, that's it... :)
Yeah, but what if you need to take over their mines? After all, practically always, resources other than wood and ore are guarded. And you can't take over mines with the army of hired heroes. And by the time you get there with your main army... U-u-u-u-u... At this point, the AI enemy can (and most likely will) capture the ally's cities and their mines before you. And that won't be good.