I have been consistently able to use all of my SWU each and every year (Y to J), to the point that I have to pick and choose which routes I actually want to use them on vs not because I always run out. Granted I have a lot of overseas trips.
Now that I will be at 300,000 EQM for the year and my company has started to allow J bookings, I expect that they might become a bit less valuable to me, but to say there is no C inventory and that SWU have little value isn’t accurate IMO.