I agree, the level of trust will be better because such a decision has been made, for now download unknown applications to your phone, drive your keys there and just stay without money
Although they say that using a web wallet is not safe, I prefer this option. It is safer and safer than installing it is not clear what is on your computer.
If this is the case, then now its really possible to hack everything. If you have an understatement and the skills themselves, there are a lot of such cases related to the theft of keys from wallets.
If your computer is infected or hacked by hackers, then there is not much difference to stealing your coins from the web-wallet or from the gui-wallet. You just need to be careful and careful user. And then everything will be fine!