I’ll pit my measly 29 to your 36 club with a question Vadimier - you don’t think that some encounters (pretty much all the tank ones) would require so much work as to make it a brand new encounter? I think so, specifically with Guardian in mind. And in that sense, I think it should be left alone and a new challenge should be created (they already stated no for BfA, so for next expack maybe)
OP - I’m sorry that your friends misled you. If you wanted the sparkle kitty, it was probably in the top 5 easiest to get, and with a week of solid gearing and work, and with the netherlight crucible maxxed out you could have stomped the encounter within a few tries.
I missed out on the Grove Warden mount out of sheer stupidity and stubbornness. The result was once I found out about the mage tower appearances I went ham on that piece of content (obviously not ham enough, scrubby 29/36)