Right! I’m strongly in favor of moving to pure approval (your proposed change).
I’m also in favor of thinking about PR - pure approval wasn’t designed for multi-winner elections, and for reasons explained can easily result in “tyranny of the majority” if the voters are strongly polarized along any axis (whether by organized party or unconscious bias).
I doubt that applies to us at this time, and am also not sure that PR would be an adequate response if it did. Still, while people may be annoyed to hear it 
, it’s good to realize that pure approval for multi-winner elections has bad failure modes too.
It’s nevertheless better than approval voting with a limited number of approvals per voter.