You make valid points regarding Amy Winehouse and Freddie Mercury .... but then you negate it by mentioning Kurt Cobain.
In the last months of his life Kurt Cobain was spiralling as fast as an express train towards the end of his mortal coil.
From July 1993 Courtney Love or other within the entourage were regularly injecting Kurt with Narcan to bring him out of a semi unconscious/drugged up state so he was fit enough to perform on their US tour.
The band reconvened for three weeks in January 1994 for a songwriting/recording session for tracks for their 4th album, but Kurt was not in the right creative mind to be of much benefit with only the unfocussed intense "You Know You're Right" surviving those sessions.
His increasing Heroin intake was rapidly breaking his immune system down so by March 1994 he was diagnosed with bronchitis and severe laryngitis. Whilst in Rome he took as a substitute for Heroin a combination of champagne and Rohypnol resulting in him OD'ing. There is speculation to this day that this event left him brain damaged.
After flying back to the USA with Nirvana's US tour aborted Kurt was admitted to Exodus Recovery Center in Los Angeles, California on March 30, 1994 to detox. But a day or so later he jumped over the six foot fence and went back to Seattle where he was found dead a week later.
Disagree. In Utero was released late 1993, whereas Cobain died early 1994...a relatively short period after. He also recorded the celebrated MTV Unplugged right at the end of 93.
I think In Utero is a better album than Nevermind IMO It's certainly more grown up and darker. As his death was in relatively close to In Utero'
s release & recording of MTV unplugged, in my mind thats close enough to still be regarded in his peak. He recorded the MTV Live n' loud special in december '93 and that was awesome!
In all honesty this whole 'peak thing' is largely subjective.