First, thanks for doing this investigation. This is true tech journalism.
Second, to anyone who thinks 39 GB/day is higher than the typical home user requires, please check the I/O usage of Firefox (or other popular web browsers). I typically have several tabs open, in each of several windows. It's not at all uncommon for me to see 39 GB/day of bytes written. When you take into account write amplification, the true number could be several times this.
I think the main culprits are HTML5 that uses local storage and caching, as well as Firefox's history, and recovery features. Of course, ad block would help, but eventually you might not have much of a web left to browse.
The Intel 600p includes a five-year warranty, but we suspect most users will replace the drive within that time.
Most users? You guys should get out and see how the real world uses tech. My work PC is a first-gen i7 Xeon from 2010. I was only allowed to replaced the original HDD after it died. If I'm lucky, I'll get to replace the box with a Skylake, this year.
I keep my home PCs & components for a long time, as well. I tend to put old SSDs into less demanding or less write-intensive uses, such as media streaming boxes. My fileserver is still booting off a Crucial RealSSD C300. Of the 13 SSDs I've bought, none has yet died on me - and all are still in service (though I only use a few, on a daily basis).