Do you use the multitask button to go back 14 apps? Isn't it easier to just tap the app icon? I guess it must be personal preferenceProbably is too late to make a significant comeback but if they keep offering devices with physical keyboards on android then they could fit a nice niche segment to keep them going.
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Did a side by side test once my priv was setup and charged with my Z5 and 6P.
Essentially with same apps installed, same action launcher 3 as the main launcher all three devices pretty much performed near identically opening apps and all did really well on multitasking getting around 14 apps open without any reloading and jumping in and out of them without refreshing.
The 6P remains the coolest (warmth wise) whilst the Z5 just a little warmer, the proof was the warmest. Not overly hot but certainly provably warmer than the other two.