I am getting tired of this meme that people who can code - 'devs' - can't pick up a pen and design a logo. It is a practically xenophobic assertion.
The 'dev' type might admit to dwelling in their mother's basement, they might admit to having hygiene issues but the stereotype 'dev' type would never admit to using 'Shopify'. 'Shopify' is designed for people that are not developers. It's a hosted platform with all the 'dev' potential of mySpace or Duplo Lego. It is not what a true 'dev' wants.
So this logo maker is not for a 'dev' audience. It is for people that have a new business they want to get online. Not a 'small project' or a 'blog', but an ecommerce effort that hopefully makes money. For this audience they may want to involve a 'professional designer' at some stage, but, starting out, without the business realised, this tool makes it easy for them to get a placeholder, something to work with.
A business has to be built before someone else can take a look at it and design the logo that is the distillation of the many things that go into that business. During this phase a placeholder is fine.