This isn't a recommendation or advice but if you're after a ledger that's larger than what Xero can offer to a big org, Netsuite seems to be what Gitlab uses and is ironically enough also what Xero uses. Unfortunately (and somewhat ironically?) we're too big to actually have Xero run on Xero
If you’d like some feedback, for us it’s less a volume issue and more a case of design limitations. We run subledgers per customer in our own code for clearing and settlement (we’re a two-sided network), and posting the rollups back to Xero sometimes runs into edge cases and limitations. Recognition timing is one pain point, another is API-driven reconciliation.
What I’d struggle to give up is the ease of reporting. Xero’s report designer is right in my sweet spot for usability, flexibility, and domain-specific correctness, probably my favourite reporting tool in three decades of shaking down business software.
While I don't work on the product (directly) or speak in any official capacity, I can definitely route your pain points and compliments to the respective teams internally :)