But being amateur electronics engineer myself I actually agree with the "warranty void if opened". Handling electronics safely is not trivial and if you touch electronics with your bare hand you can easily damage it due to static discharge. And there is going to be no way of telling who is exactly responsible for the damage.
I have myself destroyed a bunch of things before I have learned the lesson.
I have also seen a lot of electronics that have been "handled" by repair shops. I repair things for fun, but I know people who do it as their day job and frequently they have special rate for repairs when somebody has already tinkered with it. Mainly because of shit people do to electronics.
I just don't like when manufacturers go out of their way to make it hard for me to understand and repair something when I supposedly own the device and bear full responsibility for my mistakes.
The FCCs argument is based on the notion that as long as you handle the device correctly, the manufacturer shouldn't be able to deny warranty _just_ because you opened it. You need to actually damage the device to lose out on warranty service.
And I can understand companies not wanting to deal with this.
When I design electronics I often think of how to make it resistant from people touching it on the outside (ports, enclosure, etc.) but there is about nothing I can do to prevent it getting killed due to direct touching the PCB.
And newer designs are only getting more and more fragile. This mainly due to more and more of the circuit being integrated in chips (so when you touch it it is more likely to hit directly a chip), faster communication paths (so they have less capacitance which could be helpful in filtering the shock) and finer manufacturing process (the chips themselves are less and less resistant to ESD).
