@tetrislife In the 2nd part of the video, the speaker asks "what if Indians had stayed connected with ancient knowledge?".
But when she says that "if engineers had stuck with Vedic knowledge, they would have invented ecosan toilets", it looks to me like wishful thinking.
Good sanitation systems is much easier to devise if you have a lot of recent knowledge and ancient knowledge could not easily (and historically, did not) deal with the new problem associated to the emergence of cities.

@tetrislife Today, our common knowledge enables us to design toilets that separate urine and feces, without using water, then let us transform these for agriculture in ways that combine eco-friendliness and good sanitation.
But it requires the ability to process large volumes and masses that were difficult to deal with in the past.
So it's not about going back Xk years, but to move towards better practices (which look a bit like old ones but are facilitated by recent knowledge and techniques).

@tfardet I was just pointing out that even something as conceptually simple as using bath water for flushing in a bathroom wasn't part of modern design. So there is a proven tendency to discount past systems and look to make the new shiny.

The "Indians would have invented ecosan earlier" point is difficult to argue for; colonization has made just survival a question in many regions.

@tetrislife I meant to say is that one should avoid glorifying anything: current system are not necessarily better than old ones on many accounts but old ones are also far from perfect, especially in our current settings.
Using bath water for flushing is better than using clean water, but it's far from ideal.
New source separation methods, which isolates urine from feces, and do not use water are a much better way to obtain valuable resources that you can then more easily reuse in agriculture.