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War Thunder is live game. It's not a single player project that after launch is updated for few months and abandoned. War Thunder is growing, we are adding a lot of new features and a lot of fixes. If you notice only new content, it means that you purposely do not want to notice changelogs and "fixed" part of the articles.
Fixes do not take more space. Fixes overwrite old files.
If you do not like proper PvP game modes, there is a huge Custom Battles section in the game where you can set up your battlefield of choice. If you find enough players willing to play with you, feel free to do it. If it's not enough for you, there are plenty of player created missions and MP missions on live.warthunder.com.
PS. You got 17k battles and you want to tell me that winning a round is not possible for you? I think you went too deep into that "rant" path.