very nice to hear, but unrealistic out there in the real world, for most people out there, they'd probably not eat something if it either doesn't have a little bit of sweet or spice in it, depending on what food it is. It's a major addition to the food's flavour and edibility, if I am making sense here, for example: You can drink a chai with no sweet, but it will be terrible, it won't be good without alteast a little bit of sweet.
So yes, it is not needed but wanted technically, but that really don't matter when taste is something people give importance too.
And you need to understand, there are some food dishes that are mean't to be sweet or spicy to a certain level, that's just how they are made. Again, can you make them without the sweet or spice? yes, but will it taste just as good? Probably not, and that's being conservative.
So there is nothing wrong in using sweet or having a bit of spice, as long as both is done in moderation, and for that, using something like jaggery is way better than white sugar.