What you’re suggesting is actually hundreds of years old from well before the existence of computers or DAWs but still no one is using it.
It turns out that judging the relative length of lines is difficult at speed compared to reading distinct symbols.
Also that 88 note piano rolls are a very space inefficient way of representing music on a page. Even a chromatic stave would be inefficient.
That really matters for people that want to sight read with other musicians and have as much viewable as possible in a compact area.
Finally, standard notation is very rich and evolved, as you’d expect for something in active use for so long. It has extensions for lots of instruments.
When people say notation can’t show X it’s usually that they just don’t know it can.
The only downside is that you have to learn it.