You have done a great job explaining this:

So while scalability sounds like a complex technological word, and the terms used to describe scalability are equally complex looking, they are based on very easy to understand concepts that pre-date the internet and blockchain technology. The underlying concept is as your business grows, can you provide the same good service you provided when you were small. This basic principle determines the success or failure of any growing business, because failure to maintain good quality products and service leads to a loss of customers and stops business growth.