Lollypop has so many GUI issues, and none are addressed.
For example, the stock appearance of the settings menu with ultra bright white background cannot be changed. So if you open Settings in any kind of dark place like a movie theater, your car at night, or a bedroom, you eyes GET BLASTED BUT FULL ON ULTRA BRIGHT BULLSHIT that cannot be toned down. Compare to 4.2 and before where the menus where white text on a gray or black background. Worse, there is no way to change this. You are stuck wincing if you need to use the menus in the dark. And you lose all ability to remain private or avoid disturbing others.
The automatic dimming feature -which you might suspect would fix this complaint- does not actually work. In a bright environment, auto dimming dims the screen to unusable. And in a dim environment, it actually makes it so dim you can't see to undo it. But if you turn it off, you get BLASTED by that damn GUI with all it's bright white crap. Auto dimming USED to work.
The "battery is fully charged" info box appears even when the screensaver is running, and you need to do that because the super bright menus and status bars now leave significant image ghosting on the screen. For the first time ever on a mobile device, I have to run the multicolor screensaver AND a burn-in removal app periodically just to remove the hole in the screen where the status bar normally appears. Again, the issue is the overall brightness of the GUI contrasting with the rest of the visual elements.
Those things plus apps crashing, loss of root, needing to be rebooted twice a day which takes about three minutes before the desktop is actually working and usable, awful plummeting battery life, sluggish performance trying to open the dialer -Look, I hate Lollypop. 4.2 and 4.4 were very good versions. I expected better from 5.0. I expected more of the same Android UI. I got some misguided experiment in casual blinding.
For me, iOs is not an option. But instead of feeling like a big Android fan and supporter, I feel like I am getting shafted, And without root and access to the bootloader, I can't even DO anything about it. I am stuck with this thing rather than being a fan in love with it.
Maybe the S6 will be decent and somehow manage to fix these things but nothing I've read mentions any GUI fixes. I'm not sure Google even wants to fix it. Afterall, they have had years to fix the contrast problem in Gmail -look at your inbox from more than few feet away and see if you can tell read and unread messages based on color. Pretty much cannot because new messages are in not very bold black over white and read messages are a slightly less black black over almost the same white. There is almost no contrast difference. You cannot tell at a glance what is going on. This problem is awful on desktop Gmail and only a little less awful on mobile mainly because you are obviously closer to the mobile screen.
Google supposedly has GUI scientists and such but they don't see to put any thought into these things. It is frustrating. Yes I will keep using Google. They are wiring my neighborhood for Google Fiber so, yeah, I am on board. But I may not be using any Android devices by the time they get to my house this year.