something like that exists, but the question is is it safe? if our assets are stored there can we avoid hackers?
when compared to storing assets in a wallet by storing assets in an exchanger, it's safer in the wallet, because the exchanger is very vulnerable to being attacked by hackers.
and if I may argue, the idea of an all-in-one is good, but if you have to save an asset, you have to think 10 times to save it there.