I agree completely. I also have more than one account and have the old editor on one and the new editor on the other. The old editor is by far the better editor.
I feel this is again one of those instances where it would have been nice to ask input of those using it regularly or at the very least let seller have a choice which they prefer to use.
If some want to use the new editor give them the option just as if other want to use the old editor allow them the option.
It doesn't always need to be one "or" the other both can be presented as an option much like now for those still using the old editor. There is an option to switch in the account preferences. So just give the option to everyone and let people choose for themselves which they want to use.
Problem solved and everyone is happy.