For me it is better to create a different wallet beside your electrum if you want to maximize your security because beside you having a local electrum wallet why not create some blockchain.info app in your phone and use that in withdrawing to different ATM machines.
Thank you for your answer.
1- Why blockchain.info app on my phone vs Electrum app (Android) both creating a new wallet? (more user friendly, etc. ?)
2- What about my sweeping, synchronizing and security questions starting in my original post after «If I create a new wallet,»?