They might not be solvable but you can get 5-10% Improvement on them, unfortunately you can't do a new product that is exactly like QuickBooks but 5% better at reconciliation etc.
If you want better software, then sure, maybe a coding assistant can help you write it faster, but when it comes to actually doing accounting I would not rely on an LLM in any way shape or form any more than I would do so for law.