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I meant the weekly increase :)
Theoretically, one-time increases have one major advantage that I forgot to mention: they motivate players to either play quickly (rush), develop their strategy (medium-length games), or actively expand (capture cities and dwellings), which is thus encouraged. In the original game, instead of expansion in a long game, creatures simply accumulated: the longer you waited, the more troops you gathered.
But how it will work in practice remains to be seen. I'm not afraid to experiment, especially since no one will stop me from rolling back in case of failure ;)