Why are online tables oval? Why not round?

[Petomane]

After so many years, why do online tables still fashion themselves after the B&Ms?
When I look at my 4 table layout, it's a sea of green - a lot of wasted space mainly.
Why not have round tables and no dealer?
In real life, you need to fit 10 humans and a dealer, hence the shape.
Isn't it time to design a more efficient online table that takes up less space?