A lot of hing is "diluted", and asafoetida is often not even the main ingredient in the container. In fact, early on, the only way I could get "pure" asafoetida, was to get it in the crystalline form, but the few stores around here stopped carrying that, and back then, Amazon didn't have much of it, so I had to get it on ebay, directly from India! When I first did this I couldn't believe the strength of it! And they had two of the crystals - one brown, one yellow, which are what they use to dissolve in oil, or water, so I got some of each of those, plus some powder, which was described as 80%. I also got some dried fenugreek leaves, which was stronger than any other dried leaves I ever had - I guess, just incredibly fresh! Now, there is some powder I get from Amazon that is labeled "100% asafoetida powder" - Naturevibe. And it is potent!
I use asafoetida a lot of times when making some cooked beans or grains to use in something, and want to get that onion/garlic flavor in an easy way. In india, there is a division of Hinduism termed Jainism, which has a different cuisine, not allowing root vegetables, like onion, garlic, and many others (though asafoetida is a rhizome, as well as ginger and turmeric, and they are allowed). The asafoetida is used a lot, in place of the onion and garlic.