Is there any kind of stress and suffering the Buddhas medicine would not help?

Often my person comes accross certain "*disclaimers*" in regard of the use of Dhamma-Practice, the medicine of the Buddha, his therapy, saying, like just read again [here in an answer](https://buddhism.stackexchange.com/a/23114/12162) : >"The Buddha did not deal with this kind of suffering. Modern mindfulness centers have therapists who understand this kind of suffering." So coming from such kind of predication, my person would like to ask: - What is the fundation and/or the possible reason of such a claim? - What kind of suffering it should include? and - Where to find possible references in the teachings of the Buddha for such? - Are there any instances where either he or his disciples (with approve) encouraged to seek for diverent ways to cure certain suffering?