They sure are.Opinions notwithstanding, the steps necessary to create a new state are spelled out in the Constitution.
They are clear and measurable.
1) "New States may be admitted by the Congress into this Union"
This was done. Anyone questioned that Congress admitted West Virginia?
2) "but no new States shall be formed or erected within the Jurisdiction of any other State ... without the Consent of the Legislatures of the States concerned as well as of the Congress."
Also done. The body that was recognized by the US as the legislature of Virginia gave its consent.
Clear, measurable and complied with.