drifting cloud wrote:This is simply untrue. If this were the case, the Buddha would not have taught all of them. It is more the case that different practices reinforce and strengthen each other through positive feedback.
The Buddha taught different methods to suit different people. We may indeed benefit from practising more than just one method exclusively, but we don't need to do them all, nor even several at once.
Even within the Satipatthāna Sutta there are several different methods for body contemplation — mindfulness of respiration, clear comprehension of all daily activities, contemplation of the four elements, 32-body parts, cemetery contemplation on dead bodies in different stages of decay. When the Buddha taught this discourse he was addressing a large audience of monks who had been using different meditation objects.
Then there are techniques like Buddhanussati and Metta, which are not even mentioned in the Satipatthāna Sutta, but which can be used as the basis for concentration (instead of ānāpānassati), before switching to contemplate for insight.
I think we should mostly stick to one method, but also be familiar with other methods so that we know how to use them when the need arises. For example, if lust arises its good to know about the contemplations on repulsiveness such as the 32 body parts or cemetery contemplations, or if doubt or fear overwhelm the mind, then its good to know about recollection of the Buddha's qualities.