The panarello (black nozzle) can be disposed of if the remaining part of the steam wand is long enough to reach the surface of the milk. Note that this doesn't mean you could add more milk to raise the level in the jug. It also becomes more difficult.
The panarello tends to introduce more air into the milk, and you end up with thick foam rather than the silky textured milk that you can obtain from a 'proper' steam wand. There are less expensive options than a prosumer machine which do a better job of steaming than the panarello-fitted devices. You don't need high tech.
My first espresso machine was a Delonghi and I struggled to get consistently good results from it.