I am not sure, it is possible at least. From Anandtech about USB4 which is based on Thunderbolt 3.
Titan Ridge TB3 controllers seem to be capable of 2 DP1.4 streams (8 lanes) as long as the combined bandwidth is less than 40Gbps.
Edit: found some more stuff
The Lenovo monitor has 2 TB4...
It does have two Thunderbolt 4 ports as well. I would guess they support DP alternate mode and not just encapsulated DP inside Thunderbolt. Then you can just buy a DP to USB-C cable. But I agree that the HDMI 2.0 port is kind of useless, might be nice for running 3840x2160 with black bars from a...
Lenovo is joining the 40" 5120x2160 club: https://www.anandtech.com/show/16500/lenovo-introduces-the-thinkvision-p40w-40inch-thunderbolt-4-display-with-intel-amt
Now LG has released a monitor with the same panel. No pricing yet.
https://www.tftcentral.co.uk/blog/lg-40wp95c-with-curved-40-ips-panel-and-5k2k-resolution-announced/
It's about removing a vdev from a pool. Not shrinking the size of a vdev.
Slides here: http://open-zfs.org/w/images/b/b4/Device_Removal-Alex_Reece_%26_Matt_Ahrens.pdf (demo on the last slide)
I have PWS-920P-1R in mine, they work great.
Had PWS902-1R originaly and they were very loud, running at maximum rpm all the time (even when the server was off).
I have been runing a Win 7 vm with a 7970 on a XenServer 6.2 host for about 6 months now. The screen blinks black sometimes (maybe once a week) but except from that it's stable and nice.