That's even worse!!
There was a time (in Supremacy1914) where no coalitions existed. That made diplomacy the most important part of the game. In order to win, being a good diplomat was even more important than being a good strategist, because you had to be intelligent in order to build up alliances you can rely on. Also figuring out the relations in between the other nations and sometimes trying to modify them was very challenging, diversified and suspenseful. Espionage was important and exciting. Relations between the powers were complex, gave room for all kinds of emotions and revealed all traits a human character can have. There was betrayal, loyalty, lies, honesty... it sometimes even made sense to write anonymous messages or articles to spread rumours or to lead others on a wrong trail.
However, not everyone (in particular modern smartphone users) liked that kind of game or was able to participate in it with a chance of success. Hence the coalition feature was invented, so these can also play in alliances. I understand and can accept that. But in CoW, coalitions are already overpowered. It's already very tough to compete with coalitions if you play only with alliances by sharing maps. And you get no reward for that... while coalition members have a spy-safe chat, get the achievement for winning the map even if finishing only second, third, fourth or fifth place and, more importantly, just don't have to invest anything for getting a very reliable alliance with several others.
Now this change would make it even impossible for Just-share-map-alliances to compete with coalitions. In other words the entire diplomacy part of the game is reduced to just one click (the "join coalition" button).
To sum it up, if this is released, diplomacy and espionage are dead. CoW would be just another dumb "do more clicks or pay more and you'll win for sure" game. That would be very sad and I would seriously consider quitting CoW, although it has the potential to be a great strategy game with just a few tweaks
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Of course it's good to make multi-accounting more difficult. But not at that price!!
Multi-accounting isn't a big problem. I'm sure there are only few players who understand how to trick the IP check. And if these trade resources from one of their countries to another on large scale, spies of the honest players would usually notice that. Sure, you need some Support personnel to check reports on possible multi-accounters and Support personnel is precious, but honestly I'd much rather live with facing a multi-accounter in one of five games (I estimate they're way more seldom... so far I haven't seen any) than being forced to play in coalitions.
And don't answer "you still have the market to trade if you don't play in a coalition". The market now already often is dead. With these changes, everyone will trade within their coalitions only and from the market you can maximally get resources from the AI.
What are wolf packers and account pushers?
Bottom line please either
* prohibit trade within coalitions as well, or
* (better) keep trading of resources allowed for everyone and remove the 10% tax from the market again.