@Louis I understand that you are putting all your efforts into the upcoming mega menu. I also understand that it will improve the existing menu block, which is already the best in terms of accessibility. If the new menu/mega menu block is based on the WP 6.2 Gutenberg version menu block, then it will be a major upgrade. I have curated all the menu-related feature requests below. I hope that most of them will be addressed with this upcoming update.