IMO, the problem with Arduino in production is not necessarily one of quality, but the fact that is geared towards getting the first prototype up and running as

IMO, the problem with Arduino in production is not necessarily one of quality, but the fact that is geared towards getting the first prototype up and running as fast as possible, but is difficult to use for production where eg. real-time and safety concerns require mechanisms that aren't present or impossible to implement because the software libraries can't support them. Scheduling, real-time characteristics, safety and watchdog mechanisms, and resource management pose hard engineering problems, and are often a very unique mix for each application, and again the Arduino libraries are not typically considerate of such concerns. Add to that the usual pressures of keeping per-unit hardware costs low, to the tune of shaving a few cents off the BOM by choosing extremely constrained microcontrollers, and bending Arduino to fit those constraints becomes an unfavorable proposition. The biggest benefit of Arduino as I see it is in reducing the barrier to entry for starting a hardware project because you can just wire software and hardware modules together for a proof-of-concept, but it doesn't do much for production.