If these are your ideas of plotholes, then you're misusing the term. Perhaps you'd like these things explained more in depth, and if that's the kind of storytelling you prefer, then that's fine. But nothing about any of this (except maybe #1) actually doesn't make sense or go against any of the world's rules.
Then let me address this before going back to tackle the actual points, because I really don't think I'm misusing the term at all.
To quote Wikipedia (which admittedly isn't perfect but I think this definition is reasonable): A plothole is a gap or inconsistency in a storyline that goes against the flow of logic established by the story's plot. Such inconsistencies include such things as illogical or impossible events, and statements or events that contradict earlier events in the storyline. I would also add onto that things that contradict plain, common sense, but I suppose you're welcome to dispute that addition.
Now, you can argue whether my arguments are right or not, but if you do accept that my argumentation is correct, then I don't see any way that you cannot consider these plot holes. If Snoke's origins make no sense given the lore that was built up in the prequels, that is an event that contradicts earlier statements in the Star Wars storyline. If the force acts inconsistently compared with previous films, that is a plothole, because it contradicts how the force is shown to work previously. Etc. etc.
To the other points:
1) I feel like this is a pretty significant stretch, especially if Leia is unconscious. Admittedly what the force allows its users to do is so vaguely defined that it's hard to say what is or isn't feasible, but I think you'd see more usage of that in the series. A field that entirely negates the vacuum of space would have to be pretty strong, and it seems like it would have been used before.
2) I guess I missed that explanation, but it just backs the plot issue up to a previous point, i.e. Snoke's origin. But more on that in Point 5.
3) Given that not five minutes earlier a Resistance fighter crashed her ship into a friendly ship to stop him from taking out an enemy cannon, and only an hour ago had two coups back to back, I don't think the kindergarden label is inaccurate. And, again, why take the chance? The resistance is scared, many of their members are clearly not thinking very straight, and they're backed into a corner. They're probably not in the best state of mind. Why would you assume that they would be thinking logically when you can just, with a single sentence, ensure that they get what you're doing?
And the idea of Luke just acting erratically is a poor excuse at best. If he was capable of formulating a plan like that and having a last, meaningful conversation with his sister, I think his mental condition was intact enough to simply say "Hey I'm stalling them, make a run for it."
#4: Maybe I missed this, but...when was it mentioned that Qui-Gon developed the technique? At the end of Episode 3, Yoda talks about communicating with the dead, but that doesn't seem like the same thing. And, on top of that, it brings up another issue...
#5: If Snoke wields this long-distance communication power which, according to you, was exclusive to Qui-Gon, Obi-Wan, Anakin, and Yoda, then where did he get it?
The knowledge of the Jedi and Force was pretty much reduced to myth status, if A New Hope is anything to go by. Han disregards it as superstition when he first meets Luke and Obi-Wan.
As for other individuals, granted, there are plenty of force sensitive people. But Snoke, even if he isn't explicitly stated to be a Sith, is very much skilled with the dark side of the force. That takes training, and there aren't exactly a ton of people who are offering lessons in force wielding out there.
Again, why this all matters is the stakes that the universe operates by. If your universe is filled with gaping plotholes, then it's just inconsistent. To quote my previous post: "The less consistent your universe is in operating within the parameters it sets for itself, the less believable it becomes. And the less believable it becomes, the less reason I have to care about any of the stakes in these movies. If these all powerful force beings can just spring up out of seemingly nowhere, why should I care at all about what happens to Rey or Kylo? Who's to say that another highly skilled force wielder that we've never heard of and is only appearing now for some reason won't just suddenly pop up to save/destroy the galaxy next? Who's to say that there isn't some other force sensitive kid who will pop up out of nowhere to save the galaxy? When you discard the rules that you set forth for yourself, your universe becomes an utterly arbitrary place where anything can happen for the sake of whatever plot device seems coolest to the director."