I guess the ECO is looking for additional information about why you’ve been apart.
Have you travelled out to see her during this time ? , did u document it ?
Did you write a clear, concise statement about why you’ve been apart ?
Eg, you moved back to the UK to re-establish yourself, your job changed, you were
saving money to secure the right type of accommodation ?, your wife stayed to look
after family members ?
If there was no covering letter, then you’ve given the ECO an easy decision to make.
Re; your appeal under Human Rights … ie, being denied the right to live with your wife,
I think others on here can advise better on that topic.