On thing I appreciate is mdspan -- multidimensional projections onto a regular linear vector. I've always had to spin these myself which means they don't fully participate as ordinary containers (who's going to go tho all that work for their own application code).
I'm hoping I can map them into GPU space -- looks like the standard has adequate control for this.
It's often overkill for what I do, especially as it can't use the same compiler options as my tree normally does (they have to bend over backwards for back compatibility; I don't). I do use it some places. I certainly don't envy the hard work of library developers!
When I simply need a 2D or 3D resizable array it's often easier, as I mentioned, to simply spin one up. Having that support "native" will be great.
I'm hoping I can map them into GPU space -- looks like the standard has adequate control for this.