I don't get your complaints. As a big fan of ES1 and EL with 65+ hours logged in ES2, all those things you mentioned seem to be working well to me. Having to invest money and military into maintaining trade routes just makes sense and was also true in ES1. When your trade companies connect to foreign subsidiaries, that's still done automatically, by the way. 

Politics is one of my favorite additions to ES2. It's not working perfectly at current due to a bug with unhappiness, but that will obviously be fixed soon. The amounts that things affect different parties will undoubtedly be tweaked by the final product. The idea of the senate system is great, and while it's fine to give feedback on how it is now, it's not fair to think that that's how it's going to be upon release. It certainly doesn't "alienate" me from the game, at any rate.

I actually think the UI is beautiful as-is. The current tech tree is actually easier for me to read and understand than the one in ES1, so I don't understand what the problem is. If you misspoke and are talking about the production queue on planets, then uh, it's pretty much exactly the same as the one in ES1 and EL, and I'm not sure what else to say.

I read your complaints, but I don't get them at all. If there are things to complain about in the game, these are not the things. Sorry if I sounded rude or dismissive; I'm not trying to say your experience isn't valid or anything, but it certainly doesn't correspond with my experience. On the whole, I think this game is in a great spot.

Well first of all, this game is in early access, so I can't reasonably pass judgement on it until the developers say its finished. Secondly, while there are parts of the game that need some work (colonization and the planet grid for me right now), I really, really enjoy this game. I have almost 80 hours played so far, and I can't imagine myself not putting many more into the game. I love that Amplitude is using what they learned from both ES1 and EL to make a game that takes the best of both and improves on it. So to answer your questions, no, I don't feel alienated, I just feel excited for what I think this game can be. 

No.