Situations may arise when it would be worth it to develop a website using a website builder SaaS (Software as a Service) platform which offers hosting and domain:
1. A website serves both as a great way to promote your company and if you should wish to begin publishing a regular blog. This might well be the case if you are self-employed or a freelancer and want to present yourself on the web. Obviously it makes sense if you are ready to invest time on the web site construction process and provided that your project does not have a complex functionality.
2. You aim to gain experience in testing the market. Consequently, in the future you would thus be able to better formulate your goals and requirements in regard to your web project-- for example, if you want to address a professional developer.
There is a whole range of SaaS platforms which are in a state of permanent and ongoing development, so it must remain an open question as to which of them would be best suited to your specific needs.