If you use wallet accounts, you need to design your business to work the same way as wallet accounts. If the block chain gets reorganized, the wallet account balances may change. And if you need to switch wallets for some reason, it's messy to handle.
On the other hand, most businesses will prefer to work like this: "After some fixed number of confirmations, I credit the customer's account on my database. From that point on, it's the balance in the customer's account on the database that matters, not the balance in the wallet account".
If you are building a business that is critically dependent on wallet accounts, you need to accept the worst-case scenario: that you may need to provide the long-term support yourself, if no-one else is interested. And, due to the wonders of open-source software, you are able to do that.