Here comes my full feedback (the best feedback? 
):
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More civs (1 per 6 months is better than 2 per year), campaigns from existing and new civs (not all documentary style though, can be only with decent quests)…
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Cooperative play in present and future campaigns.
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Improve the AI ​​more (a good job is being done little by little with the patches and they should continue to make the AI ​​one of the best there is in RTS.
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Improve the game interface (can be changed from minimalist to another style) and the main menu (can be changed to look more medieval).
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Graphic improvement (this will come with season 5 but it still needs to be improved when it comes to polishing), along with more fauna, better and more animation in the environment and even in battles, slightly taller buildings (respecting their space of tiles), physical improvements of the siege when they are destroyed, operators, etc.
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Basic in-game editor that exists in all AoEs and should be in this one.
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Include the advanced options (in custom games) mod officially: There is a mod that provides you with advanced options (treaty, treasures on the maps, etc.). They can include it as an official option.
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More flexibility and closeness with modders in the advanced editor. Giving them more support is still key for them to continue making content for the community.
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Pause and reconnection mode (whether the pause mode is by vote or not, but these 2 things are necessary).
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Basic tutorials (apart from Art of War) by civilization.
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The only thing I ask for and that I think is missing from the hotkeys is that you can select units of the same type.
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Inclusion of mods/tweaks pack (filtered by devs) in quick play and ranked (aesthetics quality of life, as long as it doesn’t give one player an advantage over another, as it is right now AoE2-AoE3).
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Improving maps, making them more attractive to reward map control + balance improvement so there aren’t as many stalemates in Late Game.
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Add more abilities to the units and a little more micro (especially it would favor the one with more micro ability and the spectator).
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Improve the water game to favor anti-water (alternative strat), and comeback. I also don’t think it’s a bad thing that there are treasures and a better aesthetic (this is a personal opinion).
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Improve the pathing little by little and that there are units that do not prioritize buildings in any case. Some players hate this.
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Incorporate an anti-cheat system. (You commented about cheating in teams, so I understand that you are going to do something).
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Urgently improve Matchmaking (you’re doing it, good luck).
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Hitbox issues with the walls and their construction, difficult precision when selecting units or attacking a specific unit, villagers that are idle waiting to collect food and do not appear as idle…
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Reduce the Input Lag/Delay in multiplayer, in single player there is no such thing (you can check it all).
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More competent replay mode: I should can rewind, save games files. Please, improve the caster mode interface so that you can see other important improvements (also the bounty rus).
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Not being able to hide search history except for custom games. All ranked and quick match must be visible.
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Being able to see the map when a replay or game watched live ends.
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Roadmap and more Marketing.
I think it’s the best feedback that solves all the problems in the game (unless I have something left).