Can you name a decent Form of the Beast shape (legal for the Lunar Oracle) that could also cast spells without Natural Spell? (As in capable of somatic/verbal components)
Here's one. Now this one is kind of special, since it specifically calls out that it doesn't need material components to cast spells.
But apparently it can make somatic gestures.
And what do you know, for most of their spells Oracles don't need material components. Since generally for cleric spells the holy symbol or divine focus serves as this.
And from the oracle entry on the d20pfsrd: "Oracles do not need to provide a divine focus to cast spells that list divine focus (DF) as part of the components."
Now there are some cleric spells that take components, but most say divine focus. You might nitpick, and say they should default to having a component if one is listed for arcane casters, but I don't think this is something that is clearly spelled out.
Now, since you know everything, and have a desperate need to prove it, tell me exactly what Paizo intended with spell casting and shapechange magic.
It's pretty obvious you need natural spell for the form of a leopard or wolf. It's not so obvious for things that can speak and have appendages that can manipulate things. Take a raven or parrot for example.
You might make an argument that the form is alien to you, and you are incapable of duplicating the manner in which some of these things cast spells. Maybe, but I don't think this is addressed in the rules.
Now since you might respond, and you do know everything (and it comes color coded), answer the following questions for me:
1) How do Nagas cast spells? They can speak, but how do they manipulate components and make somatic gestures? Some of them cast divine spells, but most are arcane casters, so you can't get around components.
You might make the argument that they have evolved their own set of somatic gestures for spellcasting involving tail and tongue movements or something, one that would be impossible to duplicate by a dilettante shapechanger. Pretty reasonable, but is it spelled out somewhere?
And there are lots more things like this in the bestiary.
2) Can a pseudodragon familiar use spell trigger items? "They often only vocalize in chirps, hisses, growls, and purrs, but can communicate telepathically with any intelligent creature."
But wait: "Languages Draconic" what does that mean exactly given the blurb? They know a language they can't speak? I guess they understand spoken draconic maybe. Or can they speak it? If not, how did they learn it to begin with? Magically born with the knowledge of a language they are incapable of speaking and not spoken (as nothing is) in their culture? Do dragon tutors appear to teach them this language?
I might note that Faerie Dragons don't have problems with this, and while they don't have hands apparently like their larger brothers the true dragons, they don't have problems using items and such with claws.
3) Can a wizard shapeshifted into the form of a dragon cast spells? I mean his component pouch got melded, but he could have dropped it on the ground before the transformation, then picked it up. Or actually taken eschew materials. But ignoring material components, can a shapeshifted wizard cast spells?
You seem to think that this system is some kind of tautologically complete set of rules or something. I think it is anything but, and in general a lot of things that are possible under the rules aren't covered as to their ramifications.
Shapechange magic is one, just as it was in 3.x.
Now the thing about the inflict wounds is kind of a strawman. You seem to imply that someone has to be in whatever form they shift into all the time. I guess it doesn't cost druids anything to do so, but it isn't exactly a rule.
But even if you do, you can work around that with a metamagic rod.
Assuming your form can't cast spells. Personally I think if the form can speak and plausibly manipulate things it is possible.
But I don't think this whole things is as cut and dried as you seem to put forward.
And to be blunt, I also don't think that not being able to cast spells for a time is as much of a showstopper as you seem to think. If you are casting you aren't meleeing anyway, and then this whole thread is pointless. (Although honestly given the dominance of magic in this system, any kind of melee build, no matter how you do it is suboptimal.)
P.S. "Scion of War: You use your Charisma modifier to adjust Initiative checks instead of your Dexterity modifier." says hi.