I imagine that they want to give developers time to get their RDMA support stabilized, so third party software will be ready to take advantage of RDMA when the M5 Ultra lands.

I definitely would not be buying an M3 Ultra right now on my own dime.

I am typing this on my own 512GB M3 Ultra. I've just put out some feelers for 2nd-hand sale price...

I have an M4 Max I can use to bridge any gap...