Maybe also a FGPA category as sub-category of the Emulation category, just because FGPA is actually hardware emulation.
Having done FPGA's myself, on the DE10-NANO, I know that after programming a FPGA the chip starts electrically behaving as the real piece of hardware. Down to the microsecond level in 1's and 0's. This is not hardware emulation it is hardware re-creation in today's chip form-factor. Again difficult to pinpoint where it sits.
Anyway, I focus on the MSXVR for now. Let's first add some content in the current place. Afterwards we can always move it to any category we believe it should be.
P.S. The 1-chip-MSX currently sits under MSX2/2+ categories
This is partially true... Since the VDP was developed through a "black box" approach and not through having access to a decaped VDP, it is not cycle accurate, neither is perfect... It can be updated to be "nearly" accurate though, and I believe KdL and Hara-san are working on it, but to be 100% accurate and not an emulation, that would be something else. At this point, in my oppinion, it is fair to say it is an emulation, at least the VDP, not sure about T80 and other parts, but VDP is trying to emulate a 9958, not a perfect replica. It has an advantage of being an emulation using logic/hardware and thus parallelism is similar to a real 9958, which Software emulation has a hard time recreating, and perceived input lag, if using analog video output, is akin to real hardware.
It is a deep subject, but not all FPGA implementations are a hardware 1:1 copy, and MSX VDP is on of those that is not 1:1, good enough for most purpouses, less input lag perceived, but it is less accurate than OpenMSX 9958 emulation as an example... 
