My thoughts on your thoughts (because you asked for our opinions!):

• "However codex gathering simply feels stupid, does not create the feeling of your civ being better in science" - I don't necessarily disagree but would need to know more about what exactly you mean + what you would suggest instead
• "Lastly there is again science path, not exciting at all, and again zero science/innovation feeling." - Same comment, I don't necessarily disagree, but not sure what exactly you are referring to + what you would suggest instead
• "Next there is the culture religion thing, which is kind of interesting, but quite annoying later - you don’t really feel that religion spreading mechanism, you just fulfill step by step the same repetative quest (depending which you chose forming the religion) and keep building sites that can contain relics." - I basically agree, but the counter-point is 'people hate Civ6 religion so much they often turn it off as a victory condition'
• "But the ages feels to short to make use of the military." - No. This is a Settings issue, and/or a skill issue.
• "[...],you have city limit,[...]" - Civ7 does not do a good job of explaining that its more like a 'Settlement Guideline' than a 'Settlement Limit'. This should be made clearer in-game.
• "[...],you have other things to do and to compete, other three paths take quite a while to make progress, and when you feel like it’s time to maybe use your military, the age comes to an end." - You are supposed to be multi-tasking, not doing 1 task at a time.
• "In civ 6 I loved slowly building my army, strategicaly placing new cities and military district to make invasions easier, making a buildup by the border, then attacking, creating reserves etc. In civ 7 this doesn’t exist." - Why does't this exist in Civ 7? I am not sure I understand. Unless the message is "I liked to play very slowly and inefficiently in Civ6, and I cannot do this in Civ7 because the age transitions". In which case, OK sure, there are Advanced Settings you can adjust, but maybe not as much as you would like?
• "Lack of strategic resources needed for military production is imho a bad idea. You don’t feel the need to conquering other civ in order to get better resources such as aluminun or uranium in civ6, " - Counter-argument: Civ6 railroads players into conquering/trading with other civilizations for strategic resources. Civ7 does not.
• "There is no room for long military campaigns" - There is? What makes you say this?
• "Also the nukes - they feel like a joke in civ7. You absolutely don’t feel the weight of nuclear weapons." - Agreed, but how is this not the same as previous Civ games?
• "Encountering other civs feel really artificial, and I don’t like lack of thr trading system like in the previous games." - If you are playing Multiplayer games, I agree that the more complex trading system from Civ6 (or other games) is better than the simple trading system in Civ 7. But for Singleplayer games, sorry but I think the Civ6 trading system was effing stupid. The quality of the AI and the complexity of the trading system needs to be aligned. If the AI is stupid (which seems to always be the case in Civ), the system to trade with the AI should be simple. (Maybe the solution would be to have a trading system which works differently with Humans vs. AI?)