Why .... everyone likes it and I need a better screen.
Nexus 6 has S805 chip from Qualcomm.
S805 chip is 32-bit and does NOT support hardware encryption. As you may know, 64-bit chips are rushing to market. These new 64-bit chips follow ARMv8 architecture. ARMv8 is 64-bit, but also runs 32-bit apps faster and more efficiently.
Almost every new phone now and near future have either S808/810 or Samsung Exynos 7 or Mediatek new chips...all ARMv8 architecture. Why does this matter? Well, if flagships and majority phones have these new ARMv8 chips, then app developers will also make apps that are optimized for these high-performing chips. You may say...nahhh, it won't happen.
Look at Asphalt 8 by Gameloft. Asphalt 8 is optimized for S800 chips because that was what all flagship phones had 1-2 yrs ago.
Does it make a difference? Oh yeah. On iOS, game rendering (graphics, frame rate, details) are much better on iPhone 5s/6 than on older iPhones (e.g. 5). Same will happen on Android once these top developers optimize their apps for the new architecture.
It seems like you keep your phone at least 2 yrs (right?). Would you be happy to be 2nd class citizens in terms of app experience in 4-6 months?
Now, 2nd part...for whatever reason, S805 does not support hardware encryption (Qualcomm apparently did not give driver code to Google or whatever). So, when you encrypt your Nexus 6 (again, data protection and prevent corruption by 3rd party), your Nexus 6 will slow down...maybe even slower than your LG G2, despite all those RAM and horsepower of S805 chip.
These are just technical issues that will NOT be solved on Nexus 6. There are other reports of quality issues, but those are probably fixed by manufacturer by the time you buy it.
Personally, I would buy Samsung S6 (if you like Samsung) or LG G4 (if you like LG and its features). Otherwise, I would wait till later this year when Google will release its next gen Nexus phone. And it is 100% likely that it will either have S810 or S820 (ARMv8).
It is only 4-5 months away dude. WAIT.