I'm a long time user of the Arduino IDE for third party boards such as the Teensy. Recently I've switched to Platformio for coding. So I should be satisfied with never needing Arduino's cloud service.
But Adafruit points out a problem, which is that the cloud service is the only available option for students using school-issued Chromebooks. I can confirm that a school-issued Chromebook is likely to be set up to lock out access to any programming tools. We wouldn't want children to learn coding after all, right?
I think relying on a corporation to preserve our freedom to code is a bit too optimistic.
> cloud service is the only available option for students using school-issued Chromebooks
Perhaps Chromebooks are incompatible with open-source too?
Only having two UARTs can be limiting - and PIO is a no-go if you want offloaded parity checking and flow control. The PIO doesn't have an easy external clock input. No CAN or Ethernet makes usage in larger systems tricky. There's no USB Type-C comms support. Its ADC is anemic (only 4 channels, with 36 io pins?). There are no analog comparators. It doesn't have capacitive touch sensing. There's no EEPROM.
None of them are direct dealbreakers and you can work around most of them using external hardware - but why would you want to do so if you could also grab a MCU which has it fully integrated already?