As far as I can tell, voting on bugs is a placebo for users, to make them feel like they have an effect on development prioritization, but this isn’t the case; nobody looks at votes them to prioritize work. For this reason, many Bugzilla products have disabled voting. The ones that haven’t probably didn’t realize they could.
If there’s any change to be made here, it would be to globally disable voting, to avoid giving people the wrong impressions.