You can then add heat shrink to get a new cover that doesn't slip. And put plastic caps over the unused BNCs when probing high voltages, although those tend to get lost.
Who does the ergonomics at Rigol? The thing is, I wouldn't even have considered cutting the rings off if they had been easy to remove. They are too slippery when puling
away from the scope. That could have been easily fixed simply by the way the molding was done.
There is no need for me, or many users, to have a rubber ring there in the first place, because that metal is grounded and safe. But if they want to put a rubber ring on it, it needs to be easier to grab.
And as I've said, many replacement probes, which are in fact made better anyway, do not have rubber rings there.
Probing electronics is inherently a risk, and in the end if you don't have a clue what you are doing, you should not be probing with
any test equipment!