Jungler must get Sightstone?
I need some more experienced players to answer a question for me. I recently played a game where I pinged baron and asked someone to ward it because I (as Khazix jungle with sweeper trinket) had already used the last of my stealth wards. Our support proceeded to tell me to do it, I said i was out. Then i was yelled at for not buying a sightstone.
I was told the jungle is always meant to buy it and that's why i was bronze 5, which is funny because i have not tried ranked, so I am technically not even that good. I made the rookie mistake of saying i dont think Khazix buys sightstone (i usually buy stealth wards and upgrade sweeper, or just upgrade the yellow stealth trinket). I was then lectured on how i was bad, it was my fault we were doing bad, and every jungle buys sightstone.
I am relatively new to the game and may be wrong, but isnt a sightstone kind of a waste of an item slot for a junger usually (excluding Lee Sin who benefits from it greatly)?. I feel like I have rarely, if not never, seen an opposing or ally jungler buy it. Both the support and ADC in that game were adamant i was wrong and continued to yell at me.
Can someone with more experience in the jungle, maybe even a khazix main, give me some insight on this? If i should be buying a SS, and focusing way more on vision? I'll do that if its right but I feel like its cost and space in my items is not worth it.
For the record, I finished the game 18/6/16 and honestly I think the game would have ended 20 minutes earlier without my play keeping us barely in it. Heres a link to the match history if anyone wants to see if I am as bad as I am told I am. http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1813956525/223448144?tab=overview. I thought I did good that game and this is the first time I have been yelled at when I thought I was doing good. Usually I am doing terrible when someone decides to berate me, and at least it kind of makes sense at that point
but it wouldent hurt to buy it on others as well helps with counter jungling and defending your buffs
shows its working.
Same with zed jungle 18.3/7.7/5.3 KDA (only 3 games recently) and a 100% win rate 
For example.
-> Damage items. (I'm not playing Kha'Zix enough to give you a full build path)