Chandler/Monica 2 (v5.x) was a bit of a disaster for Monica. The communication around it was confusing from the start: they stopped accepting pull requests for the original version to focus entirely on the new release – which then never materialised beyond betas. That killed development of the main version for a while, until they eventually started releasing minor v4.x updates alongside the v5.x betas.
On top of that, they said you might not be able to import data from Monica v1–v4 into Chandler/Monica 2 (v5) due to a database layout change. Reading that sort of killed my use of Monica as a product.
I’d been a heavy user up to that point, but the thought of burying my data in a version that might be abandoned soon really put me off.
I’d been a small but fairly consistent contributor before Chandler/Monica 2 was announced, but between the confusing roadmap and possible data migration barrier, I haven’t contributed since.