There are good reasons for having maximum dimensions for lipos. Right now the manufacturers make lipo packs for everything including sanctioned racing so they aren't too worried about making race legal cells to race legal dimensions.
Now lets say Orion brought out a new pack using two of the platinum 20C 5000mah packs inside one case, in parallel so it's still 7.4v. You now have a 10000mah 40C pack that's 46mm high, but if there's no dimension regulations it would be perfectly legal for racing.
There's also the practical requirement of making packs that fit the cars. Lets say Orion make a saddle pack to a higher spec than the Trakpower one, but with no dimension limits it's 10mm longer. If it becomes the pack to have you are then limited to running cars that the bigger pack will fit in.
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And as to size restrictions for NiMH cells... how often have you seen a stickpack being dismantled and measured? Tabs soldered off so you can accurately measure the length? With metal calipers shorting the cell...  It's way over complicated if you ask me...
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Have a word with Marc Reinhard. He was disqualified from one of the finals he won at the touring car Euro champs because one of the cells in his car was oversize when it was measured after the race. You can buy calipers in other materials than steel, designed specifically for use in the electrical industry.
Whatever happens, the lipo packs that are being used now will still be able to be used at the same tracks.