Is Jonas Kaufmann really an exceptional tenor?

They are two very different things as far as singing is concerned. I'm no expert on string playing, but can't imagine what 'wobble' would sound like in the context of a violin.

Vibrato is a technic at the discretion of any performer, singer, string player, woodwind or brass player. Trill is a different technic applied also to any performer. Both intervene in the purity of tone, but at the "hands" of very capable artists, they are a weapon rather than a trouble and that's why they are used extensively.

As I have said before, Pavarotti would have been a different singer without his superb use of vibrato. Likewise, Kreisler as a violinst.

Parla

Harpists who can't even keep their wobble to a couple of notes call it a Glissando, it's madness, utter madness.

Read this: From the lady at Presto website!

I’ve almost exhausted my quiver of superlatives on Jonas Kaufmann, but
suffice it to say that he’s absolutely riveting as the caddish Maurizio:
the role showcases his almost superhuman diminuendi to perfection, and
his nuanced, ever-responsive acting fares beautifully under the close
scrutiny of the camera.

She is so right!

And your point would be?

He came in Florida in Kaufman Hall and during his beginning profession Yankee Stadium he did much perform Fenway Park in the Med Resurgence Design which had become well-known then.