For me, melodies come from only one place ....

The heart. I search for a melody, and the chords just fall in place.

In my view, a great song isn't written, it's 'found'.

That concept preempts considerations like 'do I do this, or that?" etc, because the song is what it is, if you go about it in the manner described. A flower grows the way it is, it's not 'crafted'. If you don't approach in this manner, but more in the 'craft' manner, then your point comes into play. If that is the case, then I wouldn't craft it more than an octave and a third or so. See, my goal is to get others to cover it, and not everyone has a great range. But, that being said, getting back to the premise of this comment....

It's been there all along, all you have to do is find it.

Just as a great sculptor chips away to the sculpture that was there all along. Now, technically speaking, the sculpture was crafted, as was the song, I'm just trying to get you to look at it from another angle, for if you do, though it isn't easy, might even require some luck, you just might write a better song.

All other songs, lesser songs, those are the songs that are written.

Could any other notes improve "Hey Jude"? Or "Because" or "Raindrops Keep Falling On My Head"? How about the notes to 'IF' by Bread, or "Both Sides Now" or "Scarborough Fair" ?

Those songs are like jewels, just waiting to be discovered.

Non jewel tunes are written. Jewel songs are there waiting to be found, and first finder, keepers.

Of course, this is a philosophical concept, and sure, the song is written, just giving a 'concept', a new way of looking at it.

And, noting that modern pop songs are all crafted, written, and most pop tunes on the radio have the same darn four chords, a fact brought to my attention by Rick Beato's YouTube channel. That fact is really sad, because in my youth, the 60s throughout the 70s, that was not the case. I think the Beatles only wrote a couple of songs using the current popular four chords ( and I'm not even getting into 'songs with beat tracks', that world makes no sense to me at all, I'm old school, I guess ).