@Raian Incomplete coverage of all Etsy API endpoints. For example ones I use for analysis include payment-account/ledger-entries for example, which is easy enough to code via a custom node.
Note, your incomplete coverage is on par with other solutions (Pipedream, make.com etc) who also focus the integrations with transaction/listing management, but those also allow custom API coding and expose the additional API key.
You might recall this was part of my original request for Etsy to allow custom coding: OAuth 2 Code Grant workflow