Donkey Kong 64's tutorial is very poor. Most 3D platformers give you a safe area or easy first level, within which you can explore and learn the mechanics at your own pace. DK64 instead forces you through several tiny tutorial gauntlets, and it's a little jarring.
Which is super weird because the same developer (Rare) made Banjo Kazooie a year earlier! BK had a tutorial level with a bunch of easy enemies and platforming and it worked great. I have no idea why DK64 was so different in comparison
I would wager it was a last-minute change as a result of focus testing. There is a lot going on in DK64, and sometimes you're too close to a game to realise that all those button combinations aren't the most intuitive to new players - and given the slapped-together nature of the tutorials, it makes me think it was an afterthought at best.