I gotta agree with you - properly maintained a stock 6 volt systems work fine and are reliable.
My first ever 12 volt alternator conversion was to my FIL's Super M about 35 years ago. The tractor was used primarily for operating a mounted picker - usually in the dark. Having enough amps to run several auxiliary work lights were the primary concern. Further, the tractor been "hot rodded" with (high compression head, M&W pistons, etc). So even with the stock 6 volt system in perfect shape, it cranked slow and was sometimes difficult to start - especially when the engine was hot. Pulling or jumping the outfit in the middle of a cornfield was pretty much out of the question. So a 12 volt alternator conversion made good sense for this tractor.
My FIL gave me the tractor when he quit farming. I left the alternator in place since I now use the tractor to skid firewood, push snow and pull hayrides at a friend's Christmas tree farm. Reliable starting in winter weather is reason why.
But I also own two other tractors - a Super H and a Minnie-Mo U. I've left both stock 6 volt because I they serve me well and I just like 'em that way. Besides....to me there's just something "right" about the slow roll then engine catching of a well-tuned 6 volt tractor.
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Bottom line: Unless there's a compelling operating reason to convert to 12 volts, my vote is to retain the stock 6 volt systems whenever possible!
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