ROCAF did want to buy F-35, the Americans told them hell no, probably for the reason you mentioned.The F-16V is a decent fighter, but 220 is totally inappropriate for a country the size of Taiwan. In a conflict how many are they going to get airborne? A smaller number of F-35s or a mixture of F-16V & F-35s would have been much better.
I bet when the war happens, most of these don't leave the ground and end up straight in the PLAAFs inventory.
I watched a retired ROC general talk about what weapons to buy and he was saying the best aircraft for them to buy is actually F-35B, even if they don't intend to use it on ships. Land based F-35B's VTOL would mean they might actually be take off even if runways were crated.