I have an iPhone 3G, is impressive how some things aren't improved proportionally 11 years after, opening the camera is about same speed in my iPhone 11 and the 3G, of course quality has improved hugely, but SSD speeds aren't, and this makes a super 2019 6 core processor looks sometimes not so new against the super old 2008 samsung RISC II mono processor.
iPhone 3G still can do most of the most important features as the iPhone 11 can, so Apple Pay and Fails ID maybe are a super improve, but if you look objectively, tech hasn't advanced so so so much.
camera and screen quality/size are the only selling factor in smartphones, nobody cares about other specs as all look same year after year.
My 4S works as fast as the iPhone 11 for common task, Siri maybe bit slower, other things, same.