Why set underscores equal to a function?

I've searched for an answer here and elsewhere online, but all topics deal with either iterating a table, metatables, or times when _,var1 = do_some_stuff() which are not the case here.

This is just a non-realistic function, but containing examples of what I mean:

function do_some_stuff(data)
    _ = some_function(data)
    some_other_code
    _ = some_other_function(data)
end

Wouldn't this be considered the same as simply entering:

function do_some_stuff(data)
    some_function(data)
    some_other_code
    some_other_function(data)
end

I know that if I create a basic Lua program like this both versions run the same:

function hello(state)
    print("World")
end

function ugh(state)
    _ = hello(state) -- and w/ hello(state) only
end

ugh(state)

I just would like to know if there can be a time where this _ = some_function() is necessary?

There is no benefit to _ = do_some_stuff(), rather using do_some_stuff() is fine and more accepted. The underscore provides no benefit when used in this way.

Thanks Etan Reisner and Mud for the help and clarification.