☑ A website created on a SAAS platform (Wix, Shopify, Tilda etc.)
➡ When starting a new project, a great temptation is to use a "ready-made" solution. However, in the development process, many disadvantages are revealed. The most important of them are the limitations of the functionality of the platforms themselves and the maintenance cost.
☑ The website was created on a "unique" self-written engine.
➡ The uniqueness of the technical component of the website in most cases is a huge disadvantage, not an advantage. Unless your company is a corporation with a staff of developers, such "uniqueness" will cost too much. Or the website will become obsolete without a chance to be updated.
Most problems are successfully solved by porting and using WordPress as a content management system (CMS).