Grandmastersexsay,
The good thing about our world thus far is people still have freedom to have different values and priorities and can make choices accordingly. Some people value good build quality. Holding up a HTC One or iPhone is definitely different than the S4 or G2, for example. You personally are good with the trade-offs S4 engineers made, and that's cool - go get the S4. But your priorities and values do not represent everyone else. I have owned smartphones for 4 years now. I've dropped my phone twice. I tend to be mindful with my gadgets, not just phones. I also appreciate audio performance. So I am happy with my HTC One - it fits my needs perfectly. I had the rezound before, and bought a spare battery. I only used the spare exactly once throughout its life time as my primary device. My usage pattern just happens to allow me to recharge easily and frequently. Would I go with a removable battery if given the choice? Absolutely. But it's not life or death. For me. So arguably each person's best phone depends on his/her specific needs.
Now, from a technical perspective, you raise some good points about the S4's pros. It sounds like you're an engineer by training, just like probably a good chunk of readers on a site like this, me included. There's so many different points to discuss, why don't we just touch on the screen here. So, you probably know about the pentile (or now the weird diamond) layout that Samsung uses with its OLED. It has full RGB AMOLED screens and have used them before (denoted by the "plus" at the end if I recall correctly). But Samsung chose not to. Not for quality reasons - simply lower cost. On this point, I think it's a bit hard to argue that the S4 has the best screen. The color saturation is all off, and before the current 1080p diamond config, I literally see a green tint/outline when looking at Samsung AMOLED devices (S3, note 2, etc). For me, it's like looking at those old optical illusion prints where if you stare at the center long enough, you see 3D-ish effects or see a different picture. I simply can't use those Samsung AMOLED devices for this reason alone. The iphone and HTC One's IPS screens are decently tuned and calibrated, and I don't have any problem viewing them. Sure, with tuning and full RGB layout, the AMOLED would be superior to LCD except for probably max brightness and longevity. But these Samsung screens are obviously very oversaturated and don't use full RGB. As it stands right now,
For what it's worth, I have friends with S4, One, iphones and Moto Maxx. iPhones always tend to have the strongest graphics hardware for its generation. S4 has the removable backplate for battery and microSD, and if you drop your device a lot, the plastic probably will help. The One was the first Android phone with OIS, and the stereo speakers are great. Moto Maxx has that stock feel with the biggest battery. It's great to have choices.
Actually, if I had to choose the best Korean plastic android phone, I'd go with the LG G2 over the S4. But that's another story for another time...