The only reason I can think of for somebody wanting to use a legacy address would be for message signing. There is no benefit to using this type of address. If you want an address that is compatible with services that don't support bech32 withdrawals you can just use a wrapped Segwit address.
There really isn't any reason.
Unfortunately, Electrum never supported nested Segwit addresses. A workaround would be to generate a BIP39 seed and import it into Electrum. That introduces too many points of failure and I generally recommend against it. If you want compatibility and also Segwit benefits (to a smaller extent), then you should use another wallet instead of using the workaround.