The structure has quite a high ground clearance. As evident from the image above, most people are unable to rest their 2 feet on the ground if they are seated on the structure. They will need to tip toe just to touch the ground, like the lady in the white Polo T.
The structure is made of 2 horizontal cylindrical bars. When seated on, the bum will actually sink in between the bars with both legs overhanging the front bar. It creates a natural slouching position. In addition, the bum will feel uncomfortable due to lack of support.
I am not sure if the design of the structure has been studied ergonomically before implementation. Fortunately, it appears that this structure is not implemented in other bus stops island-wide. I hope that the structure gets replaced with a more conventional bench in time to come.