The Minimum Viable Nothing: ideas to validate products without building them

I'm using no code to test my ideas and No code is very powerful for validating ideas,

I build this Saas in No code, If you have a time , take a look.
Link : https://productlist.app/

My concern is that vaporware approach might be as time taking as building a decent MVP with limited set of features. May be no-code / low-code approaches might better than this route.