I hope this will make Arduino more suitable as a quick & easy dev tool for professional products.

I recently tried it out, with an STM32 board, but found out that the USB communication buffer is overwritten when data comes in too quickly. This is quite disappointing because the relevant communication protocol is perfectly capable of stalling transfers. Some internet searching revealed that many people are complaining about this. And the proposed solution of increasing the buffer size is of course not really a solution.

Someone should fix this. I know Arduino is marketed as hobbyist, and I can live with not being able to squeeze the juice out of my hardware to the fullest, but I was surprised to see that apparently they don't take correctness seriously.