Considering that Article 8 of the ECHR is framed as a negative right (as in freedom from coercion and interference):
> Right to respect for private and family life
> 1. Everyone has the right to respect for his private and family life, his home and his correspondence.
> 2. There shall be no interference by a public authority with the exercise of this right except such as is in accordance with the law and is necessary in a democratic society in the interests of national security, public safety or the economic well-being of the country, for the prevention of disorder or crime, for the protection of health or morals, or for the protection of the rights and freedoms of others.
Then it seems odd that the ECtHR decided, at some point, to start interpreting it as a positive right (as in obliging specific actions to be taken), in this case the argument that anyone should be free to instruct the state to change their sex marker on state-issued identity documentation, with minimal restrictions attached.
Also they seem to have disregarded that permitting this may have significant repercussions on the rights and freedoms of others, depending on what exactly this sex marker permits an individual to do in any particular jurisdiction, i.e. accessing services and facilities restricted to those of that sex.