It's fine for if you are making payments in person.

If you have your own lightning node, Zeus can connect to that, and you can receive without the app open.

But Zeus's real strengths are that
1. it doesn't need any other infrastructure and therefore
2. you don't depend on anyone else to move your money

Maybe Zeus users will have some hosted wallet (coinos, minibits, etc.) to receive money and if it gets too much money in it, they'll move ot over to Zeus. Get the best of both worlds and mininize risk.