What's mentioned here is trivially 'fixed', it's setting stuff which can filled in. The bigger issue is the magic system and description, especially combined w

What's mentioned here is trivially 'fixed', it's setting stuff which can filled in. The bigger issue is the magic system and description, especially combined with the very active divine system. D&D without it could be a zero-sum ignorant world like medieval times. The magic and divine systems transform it into an almost scientific world with magic replacing science. We can't easily 'fix' this like the setting stuff. To get a more static result, designers then need to introduce powerful enemies, limit magic to a few people so the results of research can make little social difference, and since that's not enough (the PCs must have access to magic and work against the enemies), introduce almost regular cataclysms. That's still not enough, since the attitude is still a modern one ('we can fix it with tech^W magic').