You know, I don't recall ever seeing 1 bar of signal strength on a smartphone. And once it's down to 2 bars, it barely works, if at all. Human brains: wow, what a bunch of suckers. Damn. By the way, is it legal to be deceptive in this way?
I work with cellular BDA-DAS[1] gear sometimes, and I don't recall the last time I looked at the signal strength display on my phone. It has probably been years.
For me: It either works, or it doesn't work. It is either fast-enough, or impossibly-slow. It's very binary, and the bar graph at the top never told me a damned thing about what I should expect.
[1]: Bi-Directional Amplifier, Distributed Antenna System. In theory, such constructs can make indoor cellular coverage quite good inside of buildings that previously had none. In reality it can be... complicated. And while the bar graph doesn't mean anything, I still need ways to see what's happening as I spend hours, days, or [sometimes!] weeks surveying and troubleshoot and stuff. The phone can report things like RSRP, RSRQ, and some other tasty bits instead of just a useless graph -- and from there, I can sometimes make a hand-waving guess as to what I may reasonably expect for performance.
But that stuff is normally pretty well hidden from view.