I'd argue that it is pragmatic and useful to distinguish between 'know' and 'believe' (or 'hypothesise'). But yes, some people do use 'know', 'think', 'believe

I'd argue that it is pragmatic and useful to distinguish between 'know' and 'believe' (or 'hypothesise'). But yes, some people do use 'know', 'think', 'believe', 'feel', etc almost interchangeably. I think this cannot help but lead to confusion.