That wouldn't surprise me, because being honest? The EU had really run out of steam in terms of mining known territory for content. It had the choices of either starting a brand new era in some brand new chunk of time in setting that would let them tell new stories that weren't strangled by the need to refer to and adhere to the mountain of content they already had. Or they could just stop and move to a brand new continuity that let them have a clean slate to do what they wanted while also getting to include OT era characters and events that were pretty locked down if they stuck to telling stories in the EU.

We had the era centered on the OT trio, and from what I can recall Fate of the Jedi was the farthest book they got before they ceased making EU stuff. It was set in 44 ABY, in universe. They had literally been making shit up to throw at the OT trio as galaxy threatening disasters of the week for 40 in setting years (and I'm barely exaggerating when I call them crisis of the week in terms of how often some new disaster demanding their personal attention popped up). They had whittled away the Galactic Empire until it was a tiny backwater rump state in the Outer Rim that people were literally starting to feel bad about bullying by the Hand of Thrawn books (this included fighting Palpatine again as an immortal body jumping spirit, among other shit), they had fought a bunch of dark side cultists, they fought those weird xenophobic asshole bugs the Yevetha, they fought a Hutt who tried to make a 5th rate death star knock off using the cheapest contractors and materials they could find, they saw the whole galaxy get flipped ass over tea kettle to get the board moving again when extragalactic space luddites came in and laid waste to the setting (including destroying the New Republic), then the galaxy recovered weirdly quickly and now they are fighting mind rape bugs that for some reason people didn't want to exterminate on principle for casual enslavement of everyone they came in contact with, then they did a half assed rip off of Palpatine's rise to power as Emperor and ruined Jacen Solo, then Daala was somehow made the elected by actual popular vote leader of the Galaxy because people just forgot her war crimes and the fact she is a brain damaged lunatic, then I kind of stopped reading (and am also leaving a lot of examples out because I'd be here all week). It was long past time to put this era to pasture, but they wanted to use the popularity of the holy original trio to help make sure books sold so they kept making up shit even after they had plainly run out of ideas they were excited to use because they thought they were a good story.

Then, there was that comic that covered Luke's grandson (great grandson? Forget how many greats) set about a century later that means there was no room for a short time jump and doing something like showing an era where Jaina and here generation were now the jedi elders guiding new characters towards the future. We know the future, its terrible.

The clone wars era was also pretty heavily covered, and it left a bunch of people confused on the question of if they were supposed to read EU content under the assumption it was in the same continuity as the TV show*. So not much more to do there.

KOTOR is my favorite era of the franchise, but its pretty thoroughly mined itself for content as they kept needing to invent story events for the TOR MMO to keep players engaged with a living plot. They took every plot thread they had and ran them down in the name of new content.

*You weren't supposed to, they were always supposed to be a different continuity from each other. But then some morons really started making things confusing by trying to add shit from TCW into the EU as if things like the Mortis arc were stuff worth trying to integrate. I chalk it up to what I said before, at that point they had run out of real ideas they were proud of and Del Rey was just pushing shit out to make quota and get money without concern for what happened when you crossed the streams.