I wonder if it would not be worth it to Toto to make a "PerfectFit" adapter which universally adjusts from minimum 10" to a maximum that the skirted area can take, which I believe is 16 inches.
That would be a truly unique product.
Perhaps it could be designed similar to the Korky flush valve with the universally-adjustable height. You just twist it to unlock, stretch it to where you want, and tighten. Toto could mark 10, 12, and 14 on the thing, but also let people set it just like they want it.
They did this, to great effect, with the TSU99A.X replacement fill valve -- i.e. have one universal product for all toilets. Why not have an adjustable Unifit? It would eliminate having to buy one separately, eliminate all the waste caused by all the 12" ones that are thrown away when someone buys a 10 or 14, and let plumbers just carry ONE on their truck.
Toto goes out of its way to be environmentally-friendly -- I mean to almost-crazy lengths (like employees can bring anything at all from home to the office and Toto will recycle it, like crushing all the Atlanta Airport porcelain they replaced and delivering it to a factory that used it in road asphalt, like recapturing the kiln heat for use elsewhere). So it makes no sense for them to have a setup where they force thousands upon thousands of 12" plastic adapters to be tossed in the garbage every year. (Nobody wants them -- Terry said in one post that he has far more than he would ever need.)
And if they don't do this, the least they could do is what HP does with its printer cartridge boxes. You buy a 14" unifit, the box it comes in doubles as a postpaid return box to Toto for the 12" UniFit that you aren't going to use, so they can recycle it.