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The idea is to shift the city building tiers from 1/3/6/9/12/15 to 1/3/5/7/9/11. This will make city development more flexible, dynamic, and non-linear. Starting cities will be level 2 (first player: tavern) and level 3 (second player: tavern + 1 building). This means that the second player will be able to realistically build the second-to-last tier in the first week. The advantage in buildings given to the second player is to compensate for the first player's advantage in turns (similar to Heroes 3, where some players started with an extra level 2 building, while others started without).
I am a fan of Heroes 3, especially when it comes to global gameplay and city development. And there were no tiers at all: instead, there were building chains that allowed you to reach level 7 on day 7 or 8.
If there are any arguments against this, please share them. But keep in mind the context: speeding up the game on the map to 2-3 weeks, as in Heroes 3 on open maps.
The argument that the early levels will become irrelevant compared to the later ones is countered. Because each level has its own timeframe. The early levels are important at the beginning of the game, and their role decreases towards the end of the game. The later levels are the opposite; and that is normal (some levels are for rushing, others are for a longer game). If you want the early levels to be strong, you just need to avoid prolonging the game; that's the whole recipe.
In addition, the concept of "building rank" will be introduced. A rank 1 building will have a production power similar to a level 1 dwelling in the original game, rank 2 will have the production power of a level 2 dwelling, and so on.
This is done to separate the concepts of "creature level" and "dwelling rank." In WGE, they don't have to match. For example, Knights have level 5, but will have a rank 6 dwelling, which corresponds to level 6 in the original game. Skeletons can have a dwelling of a higher rank than level 1, in order to emphasize the later game. Level 5 Wyverns can be built early (as in Heroes 3) with a lower-rank building, and so on. This will achieve greater diversity between cities.
Will this cause confusion? I don't think so. Heroes 3 actually uses the same mechanism. Some races have weak level N creatures, while others have strong ones. And that is the same ranking. It's just that ranks allow you to clearly see the strength of the increase.