>"Are you honestly saying that medicine (a branch of biology) is not a "hard science"? That epidemiology, or genetics, or oncology isn't?"

These fields in particular are not even close to being hard, especially oncology which appears to (somehow) be even worse off than psychology.[1:3]

I bet less than 1% of people with masters or greater in a bio field have used calculus for anything in the last 5 years. While of course the definition of "hard science" is arbitrary, here are some decent overviews of the differences between physics and bio:

https://www.cell.com/cancer-cell/fulltext/S1535-6108(02)0013...

https://meehl.dl.umn.edu/sites/g/files/pua1696/f/074theoryte...

Refs:

[1] https://www.nature.com/articles/483531a

[2] https://www.the-scientist.com/news-opinion/effort-to-reprodu...

[3]https://www.sciencemag.org/news/2017/01/rigorous-replication...