Advaita doesn't deny others philosophies. It's only at a higher plane of understanding

Advaita does not deny any philosophy. It is time Hinduism / Sanatana Dharma stopped fighting within itself.

The other thing Sanatana Dharma should learn is to allow conversion, accept those who love and want to embrace its philosophy and way of life.
Advaita is a subtler, higher realm of philosophy within Sanatana Dharma that simply conveys below: The subjective Self that you feel yourself as is Brahman. And Brahman is all there is.

This is such a powerful statement!

A word of caution that when it says Self, it doesn't mean the individual person, but that Brahman is the common self that pervades all existence, nay is existence itself.

It doesn't deny that as one is spiritually progressing, one will definitely need the support and grace of the Gods of dualism. You will see many Advaitins are also great Bhaktas. They do very much believe that these Gods exist. Advaita is only attempting to explain the deeper secret or the essential principal of the reality. So it's called the Ultimate truth, so as to not deny that Dvaita also is truth!

With this in mind, let's all move forward, spread the word, accept many more into the fold, and further enrich Sanatana Dharma.