Wow didn't expect any replies to this.
Iron, there needs to be a level of believability in all things. If someone with 20kg of armor can jump and do a flip, how much higher and farther would he be able to jump if he just jumped? Though as for jumping in itself, it can be fun to do jump attacks on enemies and to get over obstacles.
It's more of a cliche thing, everyone has the main hero trying to jump like Sonic the Hedgehog. Not that I'm bashing Sonic, just let the jump flips for Sonic to do, and Dragon Ball Z characters to do where reality doesn't exist at all. I love Larian games because of this reality factor in "yeh that can be possible" and npc's seem to be real with their own life story. Jumping like Sonic will severely degrade this Atmosphere for me, an atmosphere Larian worked hard to create since DD. There is a reason why I've check this place since 2005 on this game, usually I lose interest after a few months or no news.
Now as it being more of a progressive thing like Lar said, it won't be nearly as bad for my experience with the game. Having to unlock the feature as you gain strength and power, especially when you gain the power to transform into a Dragon. I'm hoping Dragon Morphing is a painful experience at least the first time, like it was for Link turning into a wolf in Zelda: Twilight Princess. Imagine the bones growing and twisting and wings smashing threw you back and the tail which would be a real pain in the... um.. yeh. Anyway.
Other realities that I'm overlooking (it would really drag out the game if they were not there)
Able to carry a ton of crap in Divinity 1 (too much running around work)
Able to defeat a ton of monsters pounding on you (be too sniper like working on 1 at a time)
Always able to run. (the game would probably take 2x as long to play threw and you'd get bored)
Morphing into a Dragon (this is exciting actually, and was a skill in DD to transform)
Healing from one nights rest. (I wish I had this ability, takes me a good 2 weeks to recover from running a marathon