Based on my recent trip, I agree that this is a problem.
In Ocala FL, after seeing two low rate of charges at the site, i called Tesla roadside and was advised (after destination charging that night I then called for two following day) of problems at that location. Recap:
Ocala--6 of 8 were slow; no more than mid 50's despite lower state of charge (I was at 10%). Was able to get 109 once moving to one of last two operating well when an S left.
Savannah--also, only two good (actually may have only been one) since one of the 'good' ones went to 110 briefly and then cycled down to 54.
Santee--2 of 6 bad: needed to charge more here for 200rm trip. Fortunately, I was able to get high 100's for a quite a bit before the natural cycle down. Felt bad for a couple that needed a full charge for their S but could only get 50's since my x and another s had control of the 'good' pairs.
I conclude (small sample I know) that in their mad rush to get SC's open, regular maintenance is being curtailed.