A website is not a playground to try out ones figma crayons making ever more complex figma designs. One of the lessons in about every design course or degree is, that the medium plays an important role. Web design should care about being design for websites. By not caring about the actual website and merely caring about ones figma design, one neglects the medium. The result is a bad design. Instead the design needs to carefully weigh what is easily possible with the medium, functionality, and look and feel.
I understand where you're coming from, but it's not where most users come from. Leaving scrollbars or whatever else unstyled and sticking out like a sore thumb tells those users "they can't be bothered to do it right, but everybody else does".
That's the designer's point.
If you want to go back to '94 websites so your scrollbars and drop-downs don't look out of place, good luck.