Distributing load in electrical panel
Apart from what code requires, there are various things that you might choose to do, depending on your mindset, that are not code required (nor do they conflict with code.) For instance, I prefer to keep all lighting circuits completely separate from any outlet circuits, having basically never had  light fixtures blow a fuse/trip a breaker, but having stumbled though the dark to the fusebox (yes, literally, fuses) too many times once upon a house when outlet overloads took out combined circuits (I think there were a total of 6.)

i.e. you have chosen to give the microwave its own outlet. I prefer that the refrigerator also not share (I don't recall if code does that), code requires two separate 20A countertop outlet circuits, and I'd also put a separate light circuit in the kitchen (that might share with other rooms' lights, depending on load.)

Likewise code has some specific language and requirements for bathrooms, primarily hair-dryer-driven.

Remember that code specifies the minimum you must do; it does not limit what you do beyond that, so long as what you do meets it.