by "separate country", Taiwan is governed by a group that believes it is the true government of China in exile. It might be helpful to be clear about this.
The overlapping (though not equal) border claims by the ROC and the PRC don't change the fact that they are two separate countries. No clarity is required because it really isn't relevant. Border disputes between countries is entirely normal.
https://en.wikipedia.org/wiki/Retreat_of_the_government_of_t...
This isn't a simple border dispute between separate countries. It's a governance dispute between two competing claims to a single country.
Are you making the claim that Taiwan's official historical claims somehow make the current country not peaceful? How exactly? Exactly what belligerent actions has Taiwan engaged in recently?
Actually it's not even theoretically a single country. The "China" officially claimed officially by the ROC is quite different than the "China" officially claimed by the PRC. The difference between the claims it at least Mongolia.
But you are correct it's not a simple border dispute. It is a complicated border dispute that has gone on a couple generations now. But it's also complicated dispute between two separate countries. It is quite clearly you who are trying to muddy the waters here.