Alex said:
Tracksaws are already optimised for right hand users. They just follow the design of standard circular saws which have been designed with right hand users in mind, since they make up 90% of the population.
By your logic worm drive saws and nearly all cordless saws have been designed with left hand users in mind since they have left blade setup.
The first circular saw was worm drive by Mitchel (Skilsaw) with left blade, because it is easier to use when held in the right hand. To overcome patents Porter Cable came up with right bladed "sidewinder" which is more common today. Cordless saws broke up with sidewinder tradition by having left mounted blade. Worm drives popular among framers in US have always been left bladed.