I wonder how one would extract/recover data from a retina MacBook 2015 with a dead logic board (you know s..t happen)? On MacBook Pros/previous gen MacBooks you could simply remove the SSD and place it to another Mac or external enclosure (not to mention the older models with the usual SATA interface).
It's OK if you backup your data regularly (most users don't hence the data recovery business is flourishing) what will you do if there is no backup? Sure sometimes logic boards can be repaired, but sometimes even L. Rossmann can't fix them...
The strange detail about the web cam is that it has a connector to attach the cable. This would be logical design decision if it (the cam) could be a replaceable device, but since in order to get to it one would need to separate two parts glued together (this doesn't look like designed to be disassembled or couldn't be disassemble by design if you will). My conclusion is, that it's either a bug in design or this same part is used in other models where it can easily can be accessed/replaced (Apple just saving on making two different versions of the same part). Or... there is a way to separate the glued parts Apple know aware of...