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GE VIR only provided a more accurate reference to the set but VIR was often mishandled by local stations playing tape or network feeds so sometimes it actually made things worse. VIR was probably the best attempt at color TV tint error correction ever applied to NTSC. If we had instituted the field by field color phase reversal RCA experimented with and PAL implemented instead on a line by line basis we would have had tint phase error correction baked in.
NTSC was initially specified to the dim but wide color gamut color phosphors available in 1954, but that dimness led to new brighter phosphors with different color response and gamut range being developed at that point broadcast sources started adjusting their (back in the early 60s somewhat drifty unstable cameras) to compromise between standard and new phosphors and once we went far enough down that road we could make new cameras and sets to the same compromise spec and achieve consistency in new content on new sets but not get perfect color consistency across all sets or program recordings.
Really in the tube and film era color TV was pushing the limits of what technology could reliably and affordably do. Films would fade unevenly, tube cameras would drift, network feeds had phase and frequency distortion that messed with color signal integrity and the means of dealing with all this in real time to keep broadcast schedules was often somewhat subjective and somewhat inaccurate.
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