Meaning new students would have a much easier time learning naming notes and where they are - in my experience the typical child that has taken lessons for a couple of years is still scarcely capable of naming notes outside perhaps the 6-10 they're most comfortably with. Accidentals do not help.
And everyone would benefit from visual support for the intervals.
Here's an anecdote: I have been playing piano for many years but recently discovered, because my son is learning to play cello, that I have trouble taking his cello scores and playing them with my right hand. I can play bass clefs no problem in piano music with my right hand, but my brain is apparently trained to do the translation in that context. Without it, I have to focus to not accidentally read his single system scores as a G clef.
Similarly, I've seen his teacher, a cellist giving concerts, get temporarily confused over a G-clef violin score.
Yes, these are not huge problems, but I'm personally willing to believe we could have something better.