Every manufacturer is starting to follow the Samsung model of one big, one small, but the problem is that "small" keeps getting bigger. Apple may follow that trend with the iPhone 7 and go up to a 5 inch screen. The Nexus 5X, if you look at the screen size, isn't a huge phone, but in reality it's bigger than the S6. The reason we start seeing larger devices is because there's more room to implement new technology, but also because phones are being used as personal computers by most people and smaller screens make that difficult.
I'm just glad that Google and LG took the minimalistic approach with the 5X. The QHD displays, metal designs, and large device profiles are becoming the status quo and unfortunately that doesn't always mean a better experience. Chamfered edges look nice, but get dinged really easily, so a case is pretty mandatory. Adding a case to a phone that size makes it even more unwieldy. QHD, although the Note 5 panel is absolutely gorgeous, just isn't worth the performance/battery losses. Going with a 1080p display and a larger battery in a phone that should be easy to use in one hand is much more appealing to me than having a spec beast that probably won't perform noticeably better.