I saw this the other day, no idea what he's saying but it's not good for W10M. All of the smoothness, elegance and responsiveness of WP8.1 has been thrown in the trashcan, and for what? With W10M they can't even decide on how many dots to have in the circular loading animation; half the time it's got five, the other half six.
I've watched a variety of speed-test comparison videos on YouTube where the Lumia 950 and XL faceoff against other popular smartphones. Well, guess which handsets come in last place every single time? Yep, the Lumias! Without fail, they take longer to complete basic tasks than comparable Android or Apple products, and not just by a few seconds, oh no. In one instance, an iPhone 6S Plus did a series of tasks in about 48 seconds, the Lumia 950 XL required something like 1 minute 50 seconds to do the same thing.
Honestly, I wonder if Microsoft has, like, four guys in a basement working part time on W10M. They're certainly in no rush to fix longstanding issues or optimise the software for existing hardware.