Promising is something unclear. The realization of promising idea may take 5 or even 10 years. But will investors wait for 5 or 10 years? For me is beter to have a ready product than is clear for me and usefull for people.
It's not about 5-10 years old, not even a year,
we have finished product.
He is 100% working
Investors will not wait for the development of the project within 5-10 years, this is not serious. A working product will bring results much faster.