What's possible with the medium, whether you like it or not, is a lot.
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.
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.