It is my opinion, that many of the new elements introduced by TFA and especially TLJ to stitch the different OT settings, elements and story threads together are not properly developed or placed in the context of the larger saga, and thus rather than enrich the Star Wars universe, stick out like a sore thumb. So, in my view episode IX has the difficult task to integrate and further develop these half cooked new concepts, such that it all makes sense once the nine part saga is completed. If it succeeds, and I hope it does, I might see TFA, and TLJ in a different, more positive light.
I think the three trilogies mark one large arc (obviously) that cannot be veered from too much. I understand your concerns with the ST in that we are seeing the OT rearranged in a manner that is quite familiar. This was done so it would appeal to a larger audience and make more money…period. Of course TLJ has really pissed off a certain segment of the fan base but it really just tells the OT story in a different way.
While I am very excited for IX I am just as interested in the continued spin offs and Rian’s trilogy. I think we will see things branch out into new directions.