No. Old addresses can exist alongside Segwit addresses in the same wallet.
dard way of doing it, it has alot of fail safety built into the design. It should be fine (Disclaimer: I don't use Electrum wallet)
Thanks for all the info. Very informative.
I installed electrum 3, and have now moved some to a new Bech32 (bc1?) address, how can I generate new address in the same electrum 3 wallet but w/ the old standard format? I want to send some over to the same wallet but can't because unsupported by it.
I've sort of looked around and dont see it.
Edit---
Just thought of it, would this be just sweeping private keys from wallet?