I also use online wallets because the process is very easy, I think the online wallet is safer than the wallet ofline. if we send bitcoin from our wallet to another wallet online then it is very easy process of delivery.
Online wallets are great if you want to keep there money for small expenses. I wouldn't use it as a long term storage because they can be hacked in the future. Paper and hardware wallets are the best choice if you want to be 100% safe. Why do you think that online wallets are safer? 2FA doesn't protect you at all.