There actually are a fair number of routes between primary cities in Asia with F seats and service. CX, SQ, TG, CA, KE all come to mind straight away, then there are the 5th freedom routes on the overseas carriers, some of which have F. (Cheapest way to ride in EK A380 F for example). Then there are a few carriers like OZ who have F sections but don't sell it on intra-Asia routes so a few lucky C customers get those seats with C service.

Europe and Asia are very different markets, aside from just much greater distances between cities, there are also plenty of companies here who let their employees waste ridiculous amounts of money on premium cabins even for fairly short flights. A lot more business is done face to face here and in some countries takes more visits for relationship building before deals are made, so this supports a market with real premium cabins and no shortage of people to pay for them.