It all depends on how well built the 6 volt starter is. Some work fine on 12 volts. A blanket statement saying they all will suffer is nonsense.
I've had a Deere 420, two Oliver HGs, two Case VACs, a Ford 641, and a Ferguson TO35 that have been using 12 volt batteries for 30 years now with no starter failures. Same for a Shaw tractor I have with a Wisconsin engine and Prestolite starter.
On the other hand - I put TOO much battery in a car with a 12 volt starter and two huge 12 volt batteries (in parallel). 327 V8 in my 1964 Chevelle SS. Direct-drive Delco starter. With one battery and cranking voltage at 9 volts it held up OK but was slow at times. Since I was getting big tractor batteries for free - I installed two. That brought cranking voltage up to 10.5-11 volts and starting breaking starter drives.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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