What I don't like about the app is its connection to the centralized exchanges (Kraken), I don't know if my assets will be safe on the centralized exchanges, also I can't use the app right now because my country is banned on the Kraken exchange.
I don't know if this is possible but I would prefer if the application is linked with a hard wallet (Trezor - Ledger) instead of centralized exchanges because it is safer.
I would have suggested what you said but the OP has such a solid confidence in Kraken exchange as we can see by their words below
For now, only Kraken because we see it as the most secure crypto exchange to hold crypto assets. We will add exchanges based on demand from users. But there will be multiple exchanges available so that you as a user could use your existing exchange.
Also, if you consider the profitability of the project owners, you will understand that such a business is best fit for exchanges. It is on exchanges that many buys and sells happen. The more the buying and selling the more profits for them. But if they can find a script to include hardware wallet, it will be beautiful.