I think it at least partially reflects the fact that there is a general lack of direction because the initial “long term plan” didn’t pan out. My guess is that back around 2014/2015, Disney saw the Sequel Trilogy as a means to reboot Star Wars for a new generation and pave the way for endless stories to come. This may seem paradoxical, since The Force Awakens was obviously meant to appeal to OT fans, and early plans for “spin-off” movies all revolved around OT story-lines or characters. But evidence of a broader, long term move towards a “rebooted” version of Star Wars is apparent in the fact that Disney designed their expensive Star Wars theme parks around Sequel Trilogy elements and iconography, instead of doing the obvious thing like creating a real life Mos Eisley Cantina that charges like $49.99 for a space cocktail. They were betting that emphasis on the Sequels would pay off in the long term, as a new generation fell in love with the new rebooted form of Star Wars, paving the way for endless new stories for years to come.
But… it seems this just didn’t work out. After the strong performance of The Force Awakens, Disney saw diminishing box office returns and developed the perception (whether true or not, and amplified by the most prolific posters on the Internet) that Star Wars fans were bitterly divided. When the Solo spin-off movie resulted in a net loss, they perhaps interpreted this as confirmation of their perceptions of the fan base. (Also Episode 9 was just ridiculous.)
I think this left Lucasfilm/Disney in a position where they are extremely hesitant and undecided about the future direction of Star Wars. There seems to be this unspoken acknowledgement that they should steer clear of the Sequel Trilogy time period for the time being. Contrast this to back in the late 2000s when, despite vocal criticism of the Prequels, George Lucas didn’t care and just created more and more content set in the Prequel Trilogy era. Disney has opted to do the opposite and pursue the safer (from their perspective) route of mining nostalgia with OT-centric stories.