The db probably is the cleaner place for Logseq's note storage, but invites comparison to Obsidian, whose fundamental unit of information is already a document, where Logseq's is more like a bulletpoint. Logseq being open source where Obsidian isn't could maybe blunt the edge of moving to a less-portable format, but a user can also understandably look at the status of two-way sync and see an unsexy "In-progress" and figure that's not good enough. Logseq also carries some baggage wrt instability, and the argument that the db is the pro-stability move unfortunately needs to be proven over time. Overall seems like a rough spot to be in.
I dunno. I like Logseq and wish them a good launch.