We have been putting this in front of practising accountants since the first week it was usable, and those sessions have changed the product more than anything we worked out on our own.
One has used Xero daily since 2009 and was a partner in a sixty-person firm before starting his own implementation practice. He told us the gap we had picked is real and close to unserved, and that in sixteen years nobody had ever asked him for a second ledger.
Another is an FCCA, a fractional CFO and a non-executive director, and was an investment manager at a venture fund before that. She was harder on us and more useful for it. She had already automated the straightforward half for a charity she advises, using general-purpose tools, and stopped deliberately at the point where sensitive data began. Her argument was that the half a capable person can assemble alone is not the half worth paying for. She was right, and it reordered what we are building.
We would rather hear that in a call than find it out at a renewal.