Probably because it's been two years since the Note 4 & S5 have been released and folks just aren't as interested anymore.
(although there is quite a bit of discussion on XDA, so there are SOME folks still interested)
Personally, I don't see the point, unless you're really, really bored with your device. Had this occurred a year ago, I might have been more interested although I highly doubt it, mainly because you are required to use Kingroot after you unlock the bootloader, and there has been far too much negative publicity over the past couple years regarding Kingroot. I simply don't trust it, and if you're at all concerned about privacy on your device, I would suggest doing your own research to decide for yourself if it's worth the risk.
Update: after doing a quick search, AVG reports (as of today), there are still 5 types of malware within Kingroot.
I'm fine with my original rooted stock device. I'm holding off with my purchasing of the S7 to see just how many of the Note 6 rumors hold true. That may very well be my next device, especially if it's released early.
S5 tap'n