If a system encourages people to not vote when they have no clue who they are voting for, then that might be considered a feature instead of an issue. Though one problem I can think off is that coaching of voters on how to vote becomes even more effective. I'm on the fence on this one.
Ps: is a 20% drop enough to say that something "cratered" or is this just another superlative clickbait title?
In a state that regularly sees 60+% and 70+% participation, yeah, 20% skipping those lines is a big chunk. I don't think we have final turnout numbers yet.