If I may offer a few counterpoints -
2. I think the central conflict was around Kylo/Rey/Luke/Snoke. The rest was kinda the backdrop to that. Pretty par-for-the-course in Star Wars really.
3. Not my favorite scene, but the Star Wars franchise has always played rather loose with physics. It’s a world of space wizards, laser swords, and technomagic that’s more fantasy than hard sci-fi. Probably best not to look too closely at such things if you want to enjoy the series on it’s own terms.
6. In fairness Snoke got about as much development and explanation as Palpatine did before he was killed off. Come to think of it, he actually got a little more. At least Snoke is called by his name in the movies. Palpatine didn’t even get that much until two decades later with the prequels.
9. I can absolutely believe that Luke considered it. It plays right in with his old character flaw of looking for the quick and easy way. We all have our flaws, and no matter how much we work to overcome them they’re still with us and will still come out from time to time.