I definitely share your worries, but I’m not convinced the previous KH anniversaries are a good precedent to look to. The 2010s were a weirdass time for Square, and I’m pretty confident they’ve become a fair bit smarter and more competent in how they leverage, manage, and market their big IPs. KH is a flagship franchise and KH3 was a major success, bringing a lot of new fans into the fold. If the “2020 trailer” from last year is anything to go by, they seem to be aware of this and are planning to capitalize further on the series’ potential. I mean, they’d have to be real idiots not to.
Post-KH3 2022 is a completely different world than development hell 2017 or handheld experimentation purgatory 2012. But even then, remember that DDD was in part marketed as a 10th anniversary release.