A website builder is a good thing. You can create a site in a couple of clicks, put a ready-made template, connect payment systems. But on the other hand, you may encounter big problems when using a constructor.

The concept of “website builder”
At first it seems like a builder is a good option for your project, but all that ease, speed and minimal responsibility has a downside.
Most importantly, you won't own the site. You will be given a platform on which you can place your site, but fully own the site you will not.
With the help of a website builder, you will not be able to build a multifunctional site. At your disposal will be only those functions that you will be provided by the developer of the constructor.
If you want to expand the functionality of the site, you will have to pay a certain tariff, where the functionality will be unlimited.

Choosing a template for your website
Almost all platforms offer ready-made templates, with standard structuring and most often without the ability to change anything in the design.
SEO settings that are provided with these constructors are often ineffective and very outdated. Search engines do not like such sites very much.
You will not have a beautiful domain name, your site will have a 3rd level domain.
If you want to switch to another constructor, then you will face the fact that it will be almost impossible to transfer the site automatically, only manually, each file, each folder.
Your disk space will be limited to the maximum, you will not be able to upload large files to your site, which will seriously affect the amount of content that you can publish.
Often, site constructors limit the number of pages that you can create on your newly created site. For full-fledged, large projects, you will have to switch to a paid tariff plan in order not to face this problem.
For a modern site, using a constructor is yesterday, you need to move to a larger level.
In all constructors, on free tariffs, on all pages of your site there will be various kinds of advertising, which will have a negative impact, because people go to the site, and not the advertising platform. The main disadvantage of constructors is that developers can at any time cut the functionality of your site, increase the cost of tariffs, introduce new tariffs, delete ready-made templates, etc. Here the client has little say, all you can do is endure all this.