This is one of the most important reasons I've kept using Dropbox despite having a much larger storage space on Google Drive or elsewhere. Dropbox once had superior handling of symlinks that deals with plenty of weird edge cases gracefully. I don't think I have any reason to use Dropbox any more.
I've honestly wanted to drop Dropbox for a while now. Over the past year or two, it has been becoming a worst product every single time I interact with it and also a lot spammier trying to get me to upgrade to Premium. They put a very low device limit and keep removing features. I honestly don't see any reason to use it over Google Drive anymore.
Better make that all the popular non-ext4 filesystems, 2 of which are default filesystems on the 2 major Linux-distributions out there (Red hat & Ubuntu).
Did they have to do hoop jumping with potential security ramifications to support those? Is Dropbox on Linux running entirely within the user account or is there a system level component of it with communication to a user level component? If the latter, I could see potential areas that could at least be probed for potential vulnerabilities.