Improved? Sounds like a lot of unnecessary steps when simply sweeping the private key into a wallet (I usually use Mycelium) and then putting the leftovers into new addresses is so much simpler and faster.
Why complicate things?
It's a safer method. Your PC could have been hacked and, thereby, your Mycelium could have been affected.
How often this happens-maybe infrequently, but the internet is filled with stories of hacked accounts, albeit these stories are mostly on a s-tcoin side where they have "contracts" to worry about; bitcoin (so far) has been much more straightforward.
I have Mycelium on an Android device that has never been rooted so the chances of it having been hacked are pretty slim. Also I try to never leave anything in Mycelium for longer than it take for one confirmation.
I don't really trust any wallet.