Even if they halve the number of resources needed and added more stockpile ability, this would still hurt your recourses. Makes everyone question the time investment v reward achieved and to me at the moment it wouldn't be worth it, but there are possible other ways to receive those last two recourses you need other than upgrading previous recourses.
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Games with arbitrary limits on how much stuff you can have are bad. They're just trying to micro manage the time you spend playing. A game should be fun to play, not designed to make me insert X hours to get anything worth while. Better players SHOULD advance faster. It's resource communism and it God damn sucks.