Re: why is call needed in vimscript?

I don't know what you get for ":help call"

:help call

call({func}, {arglist} [, {dict}])                      *call()* *E699*
                Call function {func} with the items in |List| {arglist} as
                arguments.
                {func} can either be a |Funcref| or the name of a function.
                a:firstline and a:lastline are set to the cursor line.
                Returns the return value of the called function.
                {dict} is for functions with the "dict" attribute.  It will be
                used to set the local variable "self". |Dictionary-function|

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