Building platforms help you create websites faster and cheaper than websites made using code.
It took me something about 2 weeks to make this website (from the idea to the very end). Since it's a multi page website consisted of 8 unique pages featured with complex animation and custom layout/forms/literally everything, it would cost something about 600€
. Ask your local developers how much they would charge for building the same website pixel to pixel. Sum it up with the money and time required for UX/UI designer work and you will see how it differs from my wage and speed.
Sometimes it's necessary to create projects with code, sometimes not. If you run an international bank or you are a director of a local airport, it is probably not your option to use constructors. So what projects are most suitable for developing on website builders:
+ landing pages
+ informational websites (restaurants, events, schools, etc.)
+ small business websites (services like cleaning, consulting, hairdressers, clinics, etc.)
+ local shops
+ personal portfolio websites (designers, photographers, trainers, etc.)
+ media websites (blogs, news)