ADHD? What do you mean?

They probably mean that with some projects, Microsoft builds something half-assed and then moves on to something else. Instead of sticking with the project, evaluating it critically, and committing to fixing whatever sucks about it until it's high quality.

One could get that impression from the Windows Store/Microsoft Store. And also the state of the Settings UI for at least the past 13 years - Windows 8 moved a small fraction of Settings to Metro design, but 13 years later there are still some pieces of Windows 7 UI left.

Or the Edge browser fiasco - how can a company as large as Microsoft conclude "eh, I guess we just can't have a browser that works well enough for enough of the web to be competitive, let's just give up and do a Chrome branch"

Or the Kin phone: "we launched this 4 weeks ago and I guess it sucks, let's just pull the plug and never mention this again"

Or Windows features like home group, libraries, and Windows Home Server - they're around for a few years, then someone decides "we don't really care about this" and dump them.