[quote=@Gentlemanvaultboy]
Yeah, but why though? There's a reason that there isn't a Strawhat with a Logia power, it kills tension. You can be attacked in, at most, 5 different ways; Surprise, Seastone, Haki, being dunked in the water, and whatever particular weakness your fruit has. Of these Seastone is super rare and only available to people of influence or Marines who have maybe a few net guns, Haki doesn't become relevant until you're almost halfway through the Grand Line, since no one can grab you the only way water comes into play is if your ship is shot out from under you (not likely, seeing as Logias are living artillery cannons capable of throwing around huge amounts of their element in whatever direction they choose), you might not even have a specific weakness depending on the Logia Fruit you ate, and the surprise thing can be countered by training your defensive transformation to be automatic. 

Anything that isn't one of those things? You are golden! You can walk through any attack, yawn off any giant monster, kind of just take a leisurely stroll through the Grand Line until you're almost at the New World at which point you start getting ruined because, holy  cow, things are now actually capable of hurting you. You are finally consistently in danger of dying.

This creates a weird dilemma, sort of like a reverse Aquaman situation. You ever seen the old Superfreinds cartoon? Well, since Aquaman was one of the main characters they always had to send the League somewhere where Aquaman had something to do, or they'd have a aquarium, or a fishtank, or something. The point is, they always had to write in something for Aquaman, even if they were in the middle of the land they had to have something where Aquaman could do his thing. If Aquaman was involved they had to write around Aquaman because otherwise he had nothing to do.

With a Logia, you have to write around them. You always have to have their weakness knocking about in a fight or they have literally already won, and then they can go and win everyone else's fight because that only makes sense because they're not hurt. You have to write something, to include [i]something[/i], to keep the Logia locked down so they don't spoil the tension of the entire situation. We start at Lougetown. For a long time locking a Logia down is going to mean Seastone, and that going to get weird because that stuff is supposed to be rare.

So either I'm not being threatened by anything, or I'm reduced to a normal, non-fruit powered person (or just taken out of the equation) whenever things get important to preserve tension. Either way, I'm bored.
[/quote]

To add on to this - Logia Devil Fruit powers tend to be uninfluenced by a person's physical prowess. 

In other words, a weak person eating the Mera Mera no mi would have Logia powers of the exact same scale as a stronger person eating the Mera Mera no mi. 

It's different from say, Zoan type fruits which actually enhance your physical abilities, and Paramecia types which can usually be used in conjunction with your physical abilities. Of course, there are some Logia fruits which are an exception, but there aren't many of those.

So, you'd be stuck at a pretty static power level for the entire journey, Devil Fruit-wise. If you're unable to level buildings with your Logia powers alone, you'll never be able to level buildings with your Logia powers alone. Or something like that.