It must have this feature
1. Don't download the whole blockchain. (light)
2. Multiple addresses
3. Generate multiple addresses from seed keys
4. If I lost everything I can always generate the wallet from seed keys.
And it does have multiple addresses. The thing is you can't label those addresses as you wish like in electrum
Yes, you may not use it like electrum but jaxx provides good support for ethereum. Using it for quite some time now and no problem in it. I think we can request the devs for some more features regarding these.
Jaxx website says they're not good for mining earning