Along the lines of what Hey Rocker was suggesting, I’d like thoughtful, well researched, pieces that aren’t written from the standpoint of a hobby enthusiast.
Example: http://www.filfre.net/ is one of my very favorite websites, and I’ve read from the hundreds of pieces the historian has posted nearly weekly for years. The blog - The Digital Antiquarian - is an exhaustive history of the evolving form of video game narrative with an eye on research, but often written in entertaining prose with a good sense of how to draw historical characters. A recent favorite was his eight part history of the tangled creation, international intrigue, and legal battles around Tetris (http://www.filfre.net/2017/06/tales-of-the-mirror-world-part-1-calculators-and-cybernetics/).
Of course, creating something similar for pinball would probably require a heavy amount of access to many, many, games, and a ton of free time to do research, interviews, writing, and editing. But, a fella can dream!