The Steam Machine and Steam Frame are probably delayed, but they still intend to release them in the first half of this year.
They said they planned to have a concrete launch window and pricing by now, but hardware pricing/shortages have made that hard to pin down.
The future is where ram is now a scarce item and everything comes with a easy pop in/out external ram slot and people are expected to move ram between devices.
It’d be like a SD card reader on laptop on all new hardware, but for ram.
That wouldn’t work, too much latency, RAM needs to be as close to the CPU as possible.