[repsilat]

I think the philosophical difference is meant to be that in HTML tables the layout was part of the markup (and so had -- or should have had -- semantic meaning) whereas with CSS Grid the table layout is part of the styling. This is alluded to in TFA's section on accessibility.

For devs who don't care so much about accessibility, and are more just interested in getting the layout they want, I guess that argument may not resonate so much. I personally don't care much for taxonomic/teleological arguments around REST methods, but I'm a bit more willing to follow fashion with Grid if it means people on screen-readers will have a better time.