A lot of confusion comes from the term “hard-wired”. The term hard-wired means the cable comes furnished with the product and is physically connected or hardwired into the household wiring. There is no plug to plug in.
All built-in appliances such as; built-in ovens, have conduit with the electrical leads attached to the range. They can then be connected right into the household wiring.
Ranges that come hard-wired are any electric range product that is defined as a built-in product. Built-in products are any size single or double wall ovens, all type of cook-tops, hoods and drop-in ranges. These appliances will come with a cable/cord to be connected into the household wiring.
All dishwashers built under the counter or the sink are designed to be hard-wired.
All garbage disposals are designed to be hard wired.
Most all other appliances such as a microwave, fridge etc. will use cords and plug in.
If you upgrade your appliances and your power requirements change, a certified electrician can help convert the power requirements.