I’ve been reading up on vim scripting in the last couple of days. When looking at available scripts on github I’ve seen a lot of code where the l: prefix for local scope is used a lot in places where it is not needed an only add to complexity. In functions, variables declared with let var = value is made local by default and adding l: only makes it look more complex. I believe that one of the most core things to think about when writing code is to make it easy to understand. You can read more about variables at the vim online help.
" Not in a function and needs to be prefixed to be local
let l:buffer = "value"
function! functionName()
" Is in a function and look a lot cleaner without a prefix
let name = "value"
endfunction