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The HN link is pg 2 of the forum thread; on page 1 a Dropbox employee states the following:

>The supported file systems are NTFS for Windows, HFS+ or APFS for Mac, and Ext4 for Linux.

>A supported file system is required as Dropbox relies on extended attributes (X-attrs) to identify files in the Dropbox folder and keep them in sync. We will keep supporting only the most common file systems that support X-attrs, so we can ensure stability and a consistent experience. (emphasis mine)[1]

XFS may support xattrs but that doesn't mean that Dropbox officially supports it. They are pretty clear on ext4 being the only supported filesystem.

[1]https://www.dropboxforum.com/t5/Syncing-and-uploads/Linux-Dr...

Edit: added link to the proper comment in the Dropbox thread

They did not explicitly say they support "any modern filesystem with xattr". They said that they support EXT4 and nothing else on Linux.

My /home is XFS on my Arch system and I received the same popup from the Dropbox client. I can confirm that this does apply to XFS as well.

Same for Btrfs