3 potential issues:jcyr wrote: ↑Thu Sep 12, 2019 1:39 amActually the whole point of rigorous standards, such as USB, USB 2.0, USB 3.0, and USB C, is to provide interoperability between vendors. A good thing, no?
Why wouldn't I buy a RFP/RPT power supply for each Pi? Because I've already got plenty of 5V supplies sitting around doing nothing. Many of them, specially the cheaper ones, work fine with the Pi.
Rigorous adherence to standards and generic no name adaptors from China are not terms I would put in the same sentence.
Chargers/adaptors are not power supplies, and may not deliver the voltage regulation required. This is likely the biggest issue people face with trying to use phone chargers as Pi power supplies.
Does a standards compliant adaptor meet the Pi's requirements in all cases? Certainly USB 1.0 came out before such high current loads were envisioned. Not sure about USB 2.0 either. For USB 3.0 the requirement of +- 5% at the source's connector against the 5V nominal which puts a legal adaptor at 4.75V. Add in a connection adaptor if you are using a micro USB cable and you are likely going to have issues.