It was nice to be able to communicate with each other without talking. However, he was a man who loved to talk. Loved being able to speak his mind. Speaking to his husband about his day or the way that things went was the highlight of his day. Being able to speak to the other half of his soul also helped keep the resentful energy at bay too.
So, Lan Wangji was not the only one to be frustrated, he was too.