I think a lot of people hear that someone who has a different brand tablet got "upgraded" to kit kat and want it too WITHOUT really knowing the upside and downside. So i do believe "kit kat upgrade envy" plays a role. Before i sold it, my nexus 7 2013 upgraded to kit kat and certain apps suddenly stopped working, etc. I found it would have been better to stay with the old. In any case there's no proof that kit kat will make the note work better or cause more issues. Btw, my new note 2014 arrives today and i hope its hassle free. I love the note 8 which my wife now has. If i find the 10.1 has issues i'll go back to the 8. I love using the spen.
Kit Kat offers huge improvements in blue tooth. That maybe just an annoyance to you but to others it is a big deal. Kit Kat is optimized for mid range hardware so the tablet should run faster. With the release of Kit Kat Samsung should also have addressed some of the bugs in Touchwiz. Others have mentioned multiuser being important to them.
I do not think wanting the most up to date software has anything to do with jealousy. That would just be silly.