Not to sound like a jerk but I cannot help but think this dude is whining about very petty issues. I read the article and found it to contain very weak arguments.
I totally can relate to the frustration when learning new stuff, especially when you have done things one way for years. Personally, the first month or so that I used hooks in react, it wasn’t pleasant, mostly due to me being uncomfortable with the additional load of learning this new convention.
I believe this is a niche service and I wish you best of luck and hope you succeed.
I would love to understand how you produce the product currently (are you outsourcing to a local commissary and if so, how are you controlling the quality?) and how you intend to scale the business.
It's been mentioned here multiple times that the idea is equivalent to a restaurant which offers delivery followed by comments suggesting the difference between your service and a traditional restaurant is that you offer "fully customizable calorie counts and macronutrient proportions". How do you ensure consistency? How would you handle competition?