…people were upset it wasn’t followed up on in Rise of Skywalker.
Fair warning, I am coming at this as a fan of TLJ who found it really worked for me after falling in love with Star Wars as a little kid in 1983, but one of the great sins of TROS is exactly that.
Every movie before that had its retcons, sometimes pretty significant, but no movie simply rolled back the previous one or refused to engage with it like TROS did. I’ve been forced to accept that there is pretty significant contingent who didn’t connect with TLJ like I did, but Disney and JJ took absolutely the wrong lesson from the backlash in how they responded. The fans who care that deeply view an installment they don’t care for as an annoying relative, but one one to be addressed, rehabilitated if possible, explained if not. Dave Filoni built his entire career on this.