Why i need bitcoin bank while i have bitcoin to use whole system was about being able to be own bank to oursellves that is why Bitcoin bank is failed system
Why do people need online wallets when they can also use a desktop wallet? It's nothing more than an optional service that you can use if you so wish. No one really forces you to do anything.
Is it better in terms of security to store everything within your own control range? Sure. But that doesn't mean people shouldn't use online wallets at all. People in most cases choose the convenience of online wallets over the security that desktop wallets offer
In general, no, it is not better in terms of security
The fact that you control the keys doesn't in the least mean that they are safe. The vast majority of users cannot set up their desktop computer in a secure enough way. Since most users today are still using Windows, you can't possibly consider your coins secure at all, even if you install antivirus, firewall, and whatnot. Coins from personal wallets get stolen everyday, we just don't hear about all these cases for either the minute amount being stolen or unwillingness of those from whom coins got stolen to expand on this. It is like car crashes versus plane crashes. You hear about plane crashes in the news but the number of people killed in the former by far exceeds the number of victims in the latter. So what is actually more safe?