That inhibition quote is not just limited to Taze imo. I'd say Americans are generally better at letting go and giving it all in performances. Especially black Americans. UK hiphop & rnb sounds constipated most of the time in comparison
that's funny, i'd tend to put it the other way round.
there's jamaican's at one end being super expressive and then at the other end there's american rap which is very emotionally cool. the uk i'd tend to put closer to the jamaican end of the spectrum; demon, bruza, poky, etc. chiming far more with that flamboyant jamaican sensibility than an american one.
only in the last few years has that switched with young thug et al. doing lots of vocal dada, while the drill lot by and large are very apathetic, but i'd posit that's a stylistic choice, rather than an emotional inhibition