Bitcoin transactions particularly from offline wallets that are infrequently used can be handled very differently from transactions done on a social media app. If you're using a Steem app, it would be very impractical to have each upvote, comment or whatnot signed by an offline device.

One pretty straightforward way to improve security is to have any large amounts of SP or liquid STEEM and SBD on accounts that very rarely interact with the blockchain and have those accounts delegate SP to your daily posting account.