The product is exactly what investors are investing in. Looking at the product, even if it is a beta version, it will be possible to predict whether it will be revived and bring income, the success of the project directly depends on it.
Having products is a very good way to introduce your coin to the market, that's why most of the projects to consider legit and promising was having a good product and sustainable. The future depends on how the product is in demand, so the market activity will increase and also we will see a much better way for the price to increase.
That's right, the future of the project depends on its product. Therefore, I cannot understand at all how people can invest in projects where there is no product, but only its concept at best.