How?
So it's a diplomacy debuff, unless it's compensated. Is it compensated with faster rate or something?
Wiz said that the AI gets an extra diplomat to compensate that it doesn't send + recall diplomats. Of course, now that balance has been altered because humans were apparently cheating (as the game tells you you're doing when using the console) by playing within the defined rules.
Not if you use ironman, which allegedly blocks cheating (at least some cheating).
But on the flipside, using the exploit definition is necessarily arbitrary. "Ally France and use it to win wars" is a tried-and-tired SP strategy that relies on something a human-controlled France wouldn't do. Exploit? Free money? The utility is greater than the supposed send/recall exploit. The rules let you do it. How do you define send/recall as an "exploit" within your constraints, but not this? You can't, it's necessarily arbitrary.
Boosting relations on arrival is something that could have not existed at all (just give relations at month end), which actually carries a semi-intuitive implication that it was placed in the game for a reason at some point, especially in the light of the AI getting an extra diplomat exactly because it can't handle them as well.
All this said, it's the defining of actions as exploits + pinning them as similar to cheating that bothers me, not the removal of the tedious mechanic. It sounds way too much like a sour-grapes MP player who lost because his opponent did something unexpected that he doesn't like, so wants it banned.
It wasn't only used by hordes, as I used it as multiple other tech groups, particularly (early game) western and nations that border hordes early (recruiting horde units was strictly superior until tech 5 and you have better cavalry available even longer). So no, not "literally only hordes", at all. Second, cherry tapping =/= exploit. Why are devs deliberately removing cherry tapping strategies?
Exploit is defined as "stuff that we changed" right now, because there's no apparently consistent basis for what gets determined as one versus what does not. You never heard of native ships as an exploit...but they still removed it after people used it to get strong positions in the new world early-ish and only after that. There is no logically consistent argument for that change which is why no argument at all was ever given. However, the most probable conclusion is that it was considered "exploitative" for Aztec to stack 20-25 heavies and sink European fleets. Wiz himself said it isn't the realism angle, so presumably it fell under "balance change" or "exploit"...I guess?
If this was an exploit previously why was the AI given a diplomat to balance against it without it having been changed or addressed until now? You don't balance a game around an exploit, unless it's only an exploit now because he says so.
So, it's an exploit, it is because Wiz says so, an exploit is what he says so and that's how this works... and this is arbitrary. You can all be right, and maybe all be wrong.