That maybe your opinion, but 'never fail' is utopia in the industrial world. And warranty on electronic equipment is never longer than 2 years, at least in our area. A cell phone has an average life time of one to two years max, considering the speed of development in that area. And as far as I know, the legal obligation for a manufacaterer to provide spares for their equipment is max. 7 years. That may be long enough for a pro user, but as a firewood guy, I am not looking forward to throwing my saw in the dumpster in seven years time (I am not a pro logger), because a spare coil or carb is going to cost me the price of a new saw at best. In 7 years from now, M-Tronic will be probably looked upon as a dinosaur control device.
For ex. Siemens makes fortunes right now by no longer supplying parts for the Siemens S5 PLC sytems. I know many companies having to upgrade their machines to the newer S7 series, just to avoid major production downtime in case of failure. And they do fail, trust me.
Customised electronics puts you as a consumer in a vulnerable position. That is something to consider when you buy a high tech device.