Yes being powered up protects you on here...unless you go weeks without logging into your account.

Of course, as was mentioned about, it does not make it very desirable if you need the money now. There is a trade-off for that security. However, how often do we encounter stuff we spend on that isnt known? All our bills are pretty much standard on the amounts and time. One only needs a bit of STEEM on a mobile wallet for walking around money.