Absolutely not, but it DOES improve the taste and smell of the finished product.
If you're growing good DNA, the primary taste of the buds will be from a high resin content vs. vegetable mass. That resin content:veg mass ratio can't be changed by anything other than storing buds in a way that will cause sublimation or evaporation of resin, In other words, you can make it worse but not better.
The 'tradition' of applying processes identified as 'curing' to cannabis are very dated. You can find references to 'curing' in early 1970s grow books. Back in the day, most cannabis was grown outdoors and from sketchy DNA. Also, you didn't just get buds, you got a load of leaf matter which has very little resin content compared to the carbohydrate vegetable mass. Leaf is harsh to smoke mainly because of the low resin content. When you're dealing with those conditions, ageing the leaf matter in a sealed container with the buds would cause a transfer of some resin to the leaf, making the mull a bit less harsh.
However, time has marched on. We discard leaf these days and we grow better DNA, obviating the need to do anything to smooth out the smoke. Moreover, THC is a rather unstable compound. It breaks down with exposure to heat and light as well as simply with time. In other words, fresher buds are stronger buds.
'Curing' is just not necessary under modern conditions and may even reduce potency.