There is so many opinions about almost everything and in each instance you can almost justify your opinion but reality is reality. Will washing your hair daily cause hair fall? The easiest answer is no it will not!
Now there is a few ways to explain it let’s start with why we wash our hair. To remove dirt, product and perspiration from the scalp. Given the climate in India it only makes sense to wash daily with perspiration, pollution etc. The growth of your hair happens internally, not on the outside of your scalp it’s actually underneath your skin. The scalp health dictates to some extent the health of your growth ( not entirely but it’s important factor) now one of the key factors for scalp health is the PH level of your scalp which needs to be 5.5. If you have too much oil or excess dirt, product or pollutants your PH is altered hence changing the environment in which your hair grows.
Washing your hair daily DOES NOT make it fall out, in fact it ensures a healthy scalp in which healthy growth can continue.
One of the main things you need to be aware of and keep in mind is what shampoo you are using. It needs to be a very neutral ideally close to 5.5ph sulfate free and that is safe to use daily.
Hope this helps make informed decision, if you only feel like washing it every 2-3 days that’s also ok as long as you don’t have any scalp issues or excess oil then you may have to increase it.