Maybe not for everybody, but I am building a new machine with
bamboo plywood.
Nor sure about the long term bending tendency but that can be mitigated by multiple layers and varnishing. Otherwise it is stronger and a bit more rigid than Birch, also somewhat more expensive and maybe more difficult to find (I have a
wholesaler around the corner).
There is also
construction grade woven bamboo that is much cheaper but not locally available to me.
It does machine exceptionally well with little dust (but very noisy). Even using a pretty flimsy CNC machine I can cut parts with an 1/8" single flute cutter to 2/1000 accuracy. No fuzzy edges or splintering.
Obviously I do not have practical performance results yet since I am still building.