Michael, I do have a video covering waste concerns: Nuclear Waste: Fission Products & Transuranics from Thorium & Uranium - "Th" Documentary 07
...essentially the current waste situation is a result of us not completely fissioning, and an inability to recycle the waste efficiently. An efficiently running MSR leaves you (almost) nothing but fission products. An MSR (breeder) could be thermal spectrum, which requires moderator and reflector to reach criticality so could be considered safer. This MSR could be fast spectrum, which then doesn't just leave you with fission products, but could convert existing actinides into fission products as well (burn all nuclear waste).
As stated in the fission-product video, partitioned fission products could do a lot of good for humanity. Unlike our current waste stream, where there's only the potential of future benefit rather than practical immediate application. (And short-term safety concerns like at Fukushima.)
For proliferation concerns, I don't think that page you've cited makes a case that any terrorist or nation would pursue a U-233 weapon. There's what is theoretically possible, then there is what is practical. There are far more practical ways to make a weapon. Which is why today's nuclear arsenals do not consist of U-233 bombs. Teapot was a test. U-233 was not pursued. The practicality will be further hindered by design specifics of the MSR. Proposed Denatured MSR are one such option.