Apple provides hardware support for a minimum of five years and now when the computer goes "Vintage" you may have another two years of hardware support if the necessary parts are still available. Some models such as the MBPro 13" (mid-2012) non-Retina model will have about nine years of hardware support. Good luck finding another manufacturer that supports the hardware for five years much less than nine years!
I am trying to repair my eight year old refrigerator and all I need is a $5 part, but it is no longer available so I must buy the whole board (it is only a few inches on each side -- very tiny and sits in the palm of your hand) and the part from official channels is $300! There are other unofficial replacement boards available for around $50 (unknown quality) and that price is even too much for what the board is and does. The technology on this board is from fifty years ago, there is no high end special chips on it just a simple relay and a few physically large resistors and diodes (available since the 60's) on it along with the relay (there are only a couple physically large surface mount components). It is just the way things are and your laptop uses more advanced and unique parts than my refrigerator does, but I still cannot get the official part at a proper price. How does this make sense? My refrigerator probably even cost less than your MBPro.