They don't get loyalty
And a few other things, but that's a major show-stopper for any decent engineer. We all look at this before any design-in for something major...
And Intel, if they don't get major design-ins that generate big volume, drop things like hot potatoes.
So, any smart engineer wanting to keep his job, won't ever design in an Intel maker type board, ever.
This isn't the first time they've abandoned everyone on a product.
Now, you can also look at the fact that they are a poor fit for intended use, draw too much power, and cost too much. For a big design in cost may not matter as much, as your boss will have a custom board made to hold the "Intel or whoever" parts and get them cheap.
This is why Microchip took such a share (and had enough spare to buy Atmel) - from their earliest series on, they kept some form of easy back compatibility or forward porting toolset available, and in some case you could move to the next model up without even changing the PCB.
Arduino and Pi are further popular because of the huge community. How many arduino or pi "killers" are themselves dead because it's not just about the hardware? It can be argued that you can do better - and better per buck or watt - for either. But when it comes time to make something actually work, that huge community that has usually already run into whatever problem and solved it is worth a lot more than a buck a part...
I don't guess Intel will read this... too bad guys, it's not like no one has tried to tell you the truth.