As to color accuracy - - - In the late 50's to early 60's, my grandparents had an RCA color TV. One of the "famous" movies either Brigadoon, South Pacific, or Oklahoma was to be shown on one of the networks. The network and each tv station to show it was "encouraged" to tweak things so that the picture quality and color accuracy was the best possible. Whatever they did worked quite well, and I've seldom seen comparable quality since. The cable companies seem to be more concerned about how many channels they can squeeze into things, at the expense of quality.
There were some tricks to the innards design of the old tube tv's. One I remember was a variable bandwidth IF. Seems that you could detect noise and signal strength, and narrow or widen the IF. This ultimately increased or decreased the higher frequencies in the video, producing less visible noise, or a "sharper" picture respectively.
In the latter 70's, we lived in the Eiffel area of Germany. PAL, SECAM, and even NSTC(Armed Forces) channels were present. Sanyo was selling a tv that had a large screen, and several smaller ones. It also had multiple tuners. You could display four channels on the various screens, and switch one to the larger screen. It automatically switched to the proper signal type. I thought that was a bit over the top, ($$$) and ended up getting a Sony that was mainly NSTC. If we wanted to really watch a PAL channel, it was in B/W only, and I had to use a small secondary PAL TV to listen to the sound.