You have said the truth the way it is. Most people are to understand everything about blockchain and the reason why private keys or backup phrase is very important, as it is these keys or phrases that gives the user of that wallet the power to do whatsoever he wants while maintaining his privacy at all times. So any wallet no matter the developer without private keys or backup phrase should be kept at a distance as it is not worthy to be used because the developers can access the user's funds.