the issue isn't rly css grid itself, it's that we use it to build
cookie-cutter containers instead of using the property for what it was meant for. if you actually leverage
grid-template-areas
and overlapping tracks, you can get some pretty wild depth w/o breaking responsiveness.
it's much easier to just slap a border on a div and call it 'design' than it is to actually think abt z-index and layering.