All of those inconsistencies come from conflicts with the EU. Disney was pretty clear that they had no intention to maintain consistency with the EU.
Except it also raises the question: why did they not do the same in RotJ with the shield of the 2nd Deathstar? Instead of risking the lives of so many people, why not jump that captured Lambda, filled to the brink with explosives inside the shield, aimed at the generator on the moon?
Honestly, also given Rey's and Kylo Ren's Force abilities, it seems to me Disney just goes for the cool factor, consistency with anything be damned.
Because it was a bad idea. Star Wars has always played fast and loose with their physics, but it was made pretty clear in the movie that jumping from hyperspace through a shield was a pretty crazy thing to do. Han also pointed out that it would work on the specific shields on the Star Killer, I don't remember the technobable he used but he did talk about the shields that teh Star Killer had specifcally.
If that isn't enough I could make up reasons why it wouldn't work on the RotJ Deathstar, maybe it since it wasn't a planet itself, you couldn't get teh data on exactly where it would be, and plotting the course would be too hard, or maybe being right next to Endor would mess things up. I'm not saying these are the reasons, I am just saying we could make some up if we needed them.
As for Disney going for cool factor over consistency, just looking at movies here, they did at least as good of a job as Lucas. Lucas gave Jedi the ability to run super fast, but only when trying to get away from destroyer droids, not when you need to get through those shieldy things so that Darth Maul doesn't get the opportunty to fight you one at a time... and kill your master.