You can look at almost every part of the 6s, and it's out of date compared to similarly priced phones: the screen is far lower resolution and isn't even OLED, the processor is 2 core vs 8 core, the RAM is 2gb vs 4gb, the storage is 16gb in the base model and isn't expandable, there is no wireless charging, no widgets, very limited multitasking, and there is no waterproofing. In essence, Apple seem to have systematically ignored all the major developments from the cellphone industry for the last few years, while simultaneously bringing in force touch, which is functionally the same as a long press (IMHO they did this so they could transform what should have been a software feature into a hardware feature in a blatant cash grab, rather than make it available to all users of iOS).
I think it would be wonderful if Apple released a phone that had the latest tech in it. A phone like that would really be worth the premium price, but I can't see it happening any time soon. They are simply too invested in pointless gimmicks at this stage.