1. Since the beginning of "mobile first" being rapidly shoved on us (and side-note, god our industry seems to love bandwagoning the new shiny stuff), I've noticed the slow but inevitable (with a northstar like that) decline and neglect of desktop interfaces. Viewing this website on desktop is a wonderful illustration and validation of that fear (though definitely take that with a grain of salt as it's heavily subject to confirmation bias).
2. The over-reliance on data. I am a big believer in data and data-driven decision making, but I think far too often we out-source our thinking to the data without ever questioning the data or our own methods for collecting and analyzing that data. I don't know anywhere near enough about how they gathered this to suggest that the data might be flawed, but I have seen (many times) reasonable, thinking people look at data and place complete trust in it without stopping to realize that at some point that data was defined and collected by another person. Even if the data is rock solid, there also seems to be rarely a thought given to the possibility of misinterpreting that data, or the possibility that the data doesn't provide useful insights in isolation. Some of the worst products I've used were the most "data driven," hyper-optimized to maximize on whatever the chosen metrics were. This seems especially subject to the fallacies of micro vs. macro when trying to optimize for populations over individual experiences. Likewise some of the best products I've used were built with little to no data, and progressively got worse the more they were optimized for "engagement" or whatever the goal is.
Now all that said, take my thoughts with a grain of salt because I am tired of having the apps I use constantly changing their UIs on me. If it's one app it's bad enough, but when you have to use a dozen or more and every one of them ships some radical update every 6 to 12 months, with typically zero user control of when that happens, it becomes maddening.