Yeah in almost a decade you're the first person to mention this despite all the min-maxers who are always bringing up little things on Discord, so... not a common sentiment
(I always wondered when someone was going to bring this up!)
It was designed this way on purpose both for aesthetic reasons and also because it saves a
lot of processing, but is also generally lenient such that the interior will always be the effective range, while there are only a handful of relevant cells in range on the edge itself.