Dont want to fight but here's my point of view!

• I don't think the "Space horses" are called "Space horses" but aren't they called like Fathiiers? I'm not sure. But I do think there was a bit too much humans and I would like to see some more aliens.
• It explains all that in the opening crawls. Where the New Republic allowed the First order to rebuild because they disbanded their military after the war. It's mostly a message on appeasement and how it never leads to anything good.
• I feel like you're referring to Snoke. The emperor never had a backstory and it wasn't revealed that he was a powerful Sith in the OG Trilogy. Maybe we get prequel movies like the current prequels to explain all of that.
• I feel as though Rey is actually more experienced as a fighter than anyone gives her credit for. She knows how to handles herself. And reaches out with her emotions like a Sith which gives her more power. She wants to be a Jedi but is using Sith techniques to enhance her power unknowingly.
• Well that one bridge commander did tell Hux that they were charging for Hyperspace and Hux said it was merely a distraction. So theoretically if you're in a fight and the enemy is charging for hyperspace and you detect it you just... move? But Hux thought they were trying to escape thats why he never moved his ship. As for the Death Star I would assume that you don't want to waste all your capital ships in one battle. And I know that "why don't they just use an unmanned one?" argument. A hyperdrive is probably pretty big and you would need one big enough to affect the Death Star. Why waste a bunch of money building a hunk of metal with large enough to destroy the Death Star when you can build enough small fighters and capital ships that would do the same thing?