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There's a difference between wanting Jungkook to explore more of his vocal abilities and dismissing what he's already demonstrated. And that's where your argument falls apart.
You claim he's been stuck in the same vocal comfort zone since GOLDEN, yet the album itself demonstrates how differently he can use his voice.
In Standing Next to You, Jungkook moves between rhythmic, controlled verses, more powerful passages and lighter falsetto, adapting his delivery to the song's retro funk and disco influences. Its dynamic arrangement gives him room to explore different vocal textures and levels of intensity.
Somebody takes a completely different direction with its electronic, synth-driven production. Jungkook opens with a noticeably darker, lower-register delivery that contrasts with the brighter passages later in the song. The recording also experiments with vocal processing, adding another dimension to its sound.
Closer to You, featuring Major Lazer, combines electronic R&B with a reggaeton-influenced rhythm. Jungkook uses a softer, breathier, almost whispered delivery, particularly in the opening verse, demonstrating how restraint and subtle changes in vocal texture can suit a different musical atmosphere.
Then there's Seven, a UK garage-influenced pop song with R&B elements. Its distinctive rhythm provides a different setting for Jungkook's vocals as he moves between smooth mid-register singing, lighter falsetto and more rhythmic phrasing.
These four songs demonstrate noticeably different approaches to vocal delivery, tone, rhythm and musical expression. NME even described Jungkook as a "musical chameleon" in its GOLDEN review. You can prefer one style over another, but calling all of this monotony overlooks what's actually on the record.
And vocal development isn't simply about singing higher or louder. Knowing when to use restraint, power, different textures or emotional expression is part of musicianship. Not every song needs to showcase the extremes of a singer's range.
His live performances matter too. Performing Standing Next to You with choreography calls for breath management, stamina and coordination, not just the ability to hit a high note.
Then there's his work beyond lead vocals. Jungkook has contributed background vocals and harmonies, which require pitch accuracy, timing and the ability to blend with an arrangement. He's also recorded vocal guides for other artists, including SUGA's Dear My Friend.
On SUCHWITA, Kim Jong-wan of NELL discussed how impressed he was by Jungkook's guide recording and how nervous it made him about recording his own version. SUGA also spoke about similar reactions from other artists. That's a documented example of his musical contribution, not just a fan's opinion.
Jungkook has also discussed studying singers and developing his own vocal approach in Weverse Magazine interviews.
And since you're comparing high notes, let's be precise: the highest note someone sings isn't the same as their full vocal range, and neither alone establishes overall technical skill. Breath control, accuracy, register transitions, agility, consistency and interpretation matter. Whistle register isn't a mandatory milestone for vocal development.
I'm attaching this video to illustrate the performances, harmonies and guide vocals being discussed.
Bringing up other members doesn't invalidate Jungkook's abilities. If you're criticizing his development, address his actual work rather than relying on comparisons that don't prove your point.
You can want him to experiment more. But that's different from claiming he hasn't shown versatility. Personal preference isn't technical evidence.