It's bound to happen when you have multiple vendors and manufacturers (both chargers/EVSEs and cars). Even though there are standards, there are gray areas and tolerances. For example, you would think something relatively simple like AC J1772 wouldn't have such problems, but there have been problems reported also. Working together: avoiding EVSE-to-vehicle interoperability issues - Charged EVs There are also issues reported with CCS even without the adapters. Fixing Chevy Bolt EV and Spark EV Charging Systems | Torque News In most cases it becomes a blame game, where the charger manufacturer blames the car manufacturer and vise versa, although the article above suggests it's the charger network/manufacturer which usually gets most of the blame from the consumer.
Not that surprising. The car owner's experience is that their car can successfully charge on some networks/hardware but routinely has trouble at another. Since the car hasn't changed, it's easy to see why they might infer that the problem must be with the new element.
Don't know but I've still seen reports on Bolt FB groups and Plugshare of people having trouble having trouble w/EA's credit card readers. My response to them is "duh. Why are you using them?" I usually try to point them to the interview. In the past month or two, I have dropped by an EA site nearby and seen that two of the units were showing network errors on their CC readers.
I think Tesla should be OK with the rather ' simple looking' adapter that was shown on the various sites, or just flood the area with 5,000 Superchargers /year. HomePlug.org website is non-responsive so I can't see the spec which they say that hey have posted on the web somewhere. Qualcomm possibly among others is supposed to have a chip (set) that will handle the protocol but not being in the industry I am not allowed to see any kind of documentation. It appears as if the standards could have been moved to the IEEE or the IEC. A testing organization may have been started I haven't found out as yet. The 5 major European Automakers supposedly have set up a governing body to set up a 350KW system. Tesla was not on the list that I saw.
I think that there was a joke made earlier in this thread (or maybe it was in another related thread) to the effect that 'the great thing about standards is that there are so many of them' - and practical illustrations of that principle as it applies in various technologies. That might be true, but efforts can be made to improve standardization, or at least interoperability. Such efforts in the electric vehicle charging domain are going to be very important in allowing the transition to electric vehicles happen. The issue is not as big for Teslas, given that Tesla Supercharging largely 'just works'. But lack of standardization for all the other vehicle and charging combinations out there could be a huge drawback. If people pull up to a charging station with a low charge, they need the charger to reliably work, and work well. If it frequently does not, word of mouth is going to get out there that electric vehicles are not a practical alternative. That could hold back the electric vehicle project for many years.
To add to an differing data point about the behavior I described in the 1st paragraph: I used two different ChargePoint CPE250 DC FCs on my Bolt the other night and tried pressing on the button on the SAE Combo handle to stop the charge. It didn't work. It felt like it was mechanically being blocked (not sure if it was in the handle or by my car's plug lock, blocking the tang). In one case, I pressed hard enough to the point where I could hear the microswitch in the handle. It didn't stop the charge. This above is what I would've always expected when charging via SAE Combo. The behavior I observed on the BTC Fat Boy chargers (in the video) I referenced was unexpected to me.
Getting back to the adapter, CrazyPostman has tried several software versions (11 videos) and is *mostly* successful. Success rate seems to depend on the manufacturer of the charger. Also, charge rate seems to be limited to 50kW. https://www.youtube.com/channel/UCfKS7RmY9Y_h88n6clvnKFQ/videos