I shoot PCC almost exclusively. I'll run Production and CO when I feel like I can or it's a no PCC match (AZ Single stack had a "preview" day with just prod and revo which was really fun) but I feel like most days I'm a D class at best where as if I pushed I could probably be with in A/B for PCC.
Overall the classification system is needed because my home club (Rio Salado) has too many amazing shooters to name and if classifications were based on just local matches I'd struggle to even get out of D. There is no way I'd be able to out shoot Nils (who I was squadded with for the single stack prod match) when I can't even get my splits to be less than 3-5x of what his are with out a crap ton of time and money put into shooting/practicing.