Same reason I left Chemistry. Gotta grind for 80 hours a week for a decade for a chance at a good position. And hope you don’t get stuck under a PI that steals all the credit.
Seems like I am not alone - I still tried for 4 years to make it work in pharma but realised that spending 3 days to grow primary cells to just get irreproducible results was not going go be satisfying.