alt Hacker NewsI think the default "product manager wants to build flashy animation" fundamentally contradicts that, but I also don't think it's fair to apply that criticism across all animations.
Good and useful animations communicate something, they're not there just to be there or to make it "pretty", which is most designers use them. But they can actually communicate intent, action, immediacy and other important things, if they're used sparingly in the right situations, without actually getting in the way.
Probably the most basic animation most of us PC users see every day is the very basic animation of a text cursor blinking on/off in text fields, like the one I write it right now. It's super basic, but communicates that the computer is waiting for you, it's alive and you can enter things. If it was static, you get the impression something is stuck instead, or couldn't tell exactly where the cursor is at a glance. But it blinks, and that tells us stuff.
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The cursor animation is actually a great one because it does not add any latency. By comparison, when animations are not disabled on my Pixel 6 it takes almost one second to switch application instead of maybe 100ms (double tapping the app swap button to get to the previous app running).
I agree that some things have a use and can do so without getting in the way, but I think as your example illustrates it is mostly to help new or infrequent users who aren't familiar with how the system works and often comes at the expense of regular users. Like mrob mentions (with a wonderful example), I usually want software to function like hand tools where I can just do a thing as quickly as I can do it and without unnecessary distractions. I've turned off cursor blink in my terminal and even though it isn't as bad in the browser I just turned it off in Firefox since you mentioned it (add a new preference ui.caretBlinkTime set to 0). Some of us do get more distracted by this kind of thing than others :/. Same with audio cues.
I do still like progress indicators when you might be waiting on a longer task (and when it actually indicates liveness, which too often it doesn't :( ).
Games I can sometimes appreciate the new user benefits and affecting the pace can sometimes have an artistic intent or relaxation effect that tools should not normally have. I have stopped playing games for excessive animations and will usually quickly (but not always immediately) disable anything that can be disabled. It is so common that I distinctly recall the free game Strange Adventures in Infinite Space intentially doing the opposite to great effect (it has been a bit but I think it was not only instant transitions but on mouse click instead of release).
https://rich.itch.io/strangeadventures