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Browse the list of Samsung bloatware I linked and tell me there's no Samsung bloatware.
I know it exists, it's just invisible for all practical purposes. It's shit I never use and therefore don't need, but it doesn't affect how I use my devices so I don't see it as an impediment. The question is not "is there bloatware", because there is on everything, it's whether the bloatware is a consideration when choosing hardware.
Those are two different things. To me, OneUI doesn't seem materially different from Android One or any other launcher including iOs and the late lamented Windows Metro.
Bixby I've never even touched, so I don't know what it does.