Coding style, clarity, and lack of need are all good reasons to omit it; performance isn't.
Sure it is.Performance is just as good a reason to adopt a certain style , heck, its even a better reason.
Explicit return adds less than 1% clarity in 99% of situations; while implicit returns outperforms it 98% of the time.
$ perl -MBenchmark=:all -e " cmpthese -3, { a=>sub{return int @_}, b=>
+sub{int@_},c=>sub{scalar@_},d=>sub{0+@_}} "
Rate a d b c
a 5279994/s -- -35% -52% -67%
d 8131795/s 54% -- -26% -50%
b 10997789/s 108% 35% -- -32%
c 16189364/s 207% 99% 47% --
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