Adjustable Vacuum Advance

I did not take ANYTHING out of context. I simply stated, & gave an example, of Chry using MVA.
Your 'facts' are simply wrong.
GM cars used MVA up to around 67/68 when they switched to the useless PVA. [ [ Maybe other brands, not sure]. Emissions tightening reqd less HC in the exhaust, & one way of accomplishing this was to reduce idle timing [ great for emissions, lousy for idle quality & economy ] & switch to PVA. While PVA does some of the things that MVA does, it doesn't do all of them, which makes PVA a loser.
MVA is still with us in electronic form. LS engines with their compact, efficient combustion chamber, require about 27/28* @ WOT. They idle with 22* .....

Hot rodders used to run locked dists, maybe some still do. Does the same thing as MVA: provides more timing at idle, engine runs cooler. With today's crap fuel, you run the risk of detonation with a locked dist. With MVA, the timing drops away under load, hence the beauty of it.