It's a fitment thing, and bass is good enough when fitted correctly.
When I first started using these, I found the bass response to be significantly less than I had expected, and ambient sounds were strongly passing the buds. I spent quite a bit of time to try the different sizes of rubber fitment bits, eventually finding a combination that allowed a reasonably good seal on the ear canal and that sat well in the ear.
Once fitted, the bass response is acceptable for the size of driver, and the tweaking available within the Samsung Connect app does help with the personal taste.