Things that are utterly lost in modern software design: information density, and even more importantly, consistency. It feels like every interface wants to tuck features away offscreen to be accessible only by scrolling, swiping, or behind a "flow" of several screens, each of which may have a surprising popup, redirect, call-to-action, or totally different layout owned by another team. The swipe/scroll accessible features aren't indicated in any way, you either have to know about them a priori or be tutorialized. What elements are clickable/tappable and their interactive areas are often unclear. Input types are represented inconsistently (checkboxes vs radio selectors, drop downs, sliders). Button locations for standard actions are shuffled from screen to screen. Even basic OS features on Android phones are like this. How do you access quick settings? Well, you pull down the notification shade all the way from the top of the screen with a swipe, which mostly shows your notifications but also reveals some buttons and knobs. Then you swipe down again, which this time doesn't pull down a shade, but transforms those knobs into a different set of more expansive knobs and sliders and also hides your notifications. Oh, also that first slide down might not work and only serve to temporarily show the OS status bar, if the screen you're on right now is set as immersive or something. In that case you need to do one swipe down to reveal the status bar, then quickly follow up with another for the mixed-use kindof-notification pulldown, then a third time to transform that into the screen where you can change your brightness.
I want a new design language that places consistency above all else. I should be able to accurately predict what a tap or swipe is going to do based on the information on my screen. I do not want things to pop up unexpectedly or change positions or hide themselves without my input. Computers are tools, and their users need to be able to develop mastery of them. The current thrust seems to revolve around ensuring constant surprise and novelty.