More point to add: (1) Adds more possibilities, performance improvements, operational shortcuts. (2) Adds redundant way to do one thing. IOften confuse more t

More point to add: (1) Adds more possibilities, performance improvements, operational shortcuts. (2) Adds redundant way to do one thing. IOften confuse more than help in the long run. The former also should not be excluded from application code. Application coder should also be familiar with what those are for.