I think these are references to Apple's change in software design once Jony Ive became in charge of human interface design in late 2012 as well as the 2013 Mac Pro and the 2016 MacBook Pro. From a software standpoint, I've noticed a change in the quality and feel of Apple products since OS X Yosemite, and it hasn't been for the better. I found (and still find) Photos.app to be a downgrade from iPhoto, and I'm also finding less fit-and-finish in Apple's software overall, though it still remains more polished to me than Windows 10 or Linux desktops. It's a far cry from the days where Apple was obsessed with UI design, both in terms of form and faction, from the days of the early Macintosh all the way through the Snow Leopard era.
The keyboard fiasco regarding the 2016 MacBook Pro is well-known. Regarding the 2013 Mac Pro, I'm actually typing this on a 2013 Mac Pro; it's not a bad computer at all by any means, but Apple severely miscalculated this machine's capability of getting regular refreshes due to thermal issues that they admitted to in 2017. Had it been a one-off model similar to the 20th Anniversary Macintosh, then its reputation would have been better. But this miscalculation, as well as Apple's unwillingness to correct course until their announcement in 2017, meant that the Mac Pro went for six years without upgrades, an eternity in the computer industry.
All of these issues, combined with other problems that may or may not have anything to do with Jony Ive (e.g., the lack of upgrades in the Mac Mini, the lack of user-serviceability in many Mac models, the price gouging for RAM and storage upgrades at purchase time) have eroded the reputation of the Mac brand and has caused some Mac users to switch to either Hackintoshes, Windows, or Linux.
With that being said, I've been more impressed with Apple's Mac upgrades lately. While I'm still bummed that Apple didn't make a $2,999 or $3,499 entry-level 2019 Mac Pro, the $5,999 Mac Pro appears to be a solid Mac desktop, and I'm glad that Apple listened to its customers in the creative professional market who need machines like that to do their work. I'm also glad that Apple has corrected course regarding its laptop keyboards, and the 2020 MacBook Air looks like a compelling buy. I might end up buying one later this year to replace my aging 2013 MacBook Air.