Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Questions

1. Why are flags often used as modifiers whereas positional parameters are used as targets?
2. Why do we run getopts in a while loop?
3. Why do we need ?) in the case statement?
4. Why do we (sometimes) need :) in the case statement?
5. Why do we need a separate optstring if we're resolving all options anyway?
6. Why do we need to subtract 1 from the OPTIND variable when we use it in shift?
7. Is it a good idea to mix options with positional arguments?