This just seems like a rant about how you hate Waterbenders so much because of their advantage in water. If you watch the show, Waterbenders always have had an advantage underwater. Example: In Season 1 Korra boosts herself outside of the water, proving that waterbending is just as doable underneath the surface. That's only a mobility example, but it still gets a point across. If it's water, it's water. I don't see the point in removing the ability to bend inside of water if it is 100% your source of bending.
If you ask me, you're not focusing on what the thread is about. Youre being more offensive (And pissed off) with random facts/opinions that don't even fit into this topic. The charging during firejet is toggle-able, incase you didn't get the memo. And it's not my fault if you're whole fighting style is based off of this technique. Get a new fighting style, deal with it, or simply ignore it. If you really want to argue that you love fire, you will learn all the ways of bending. Cause any true firebender could adapt to this. Not being able to charge moves during fire jet shouldn't even affect you that much. It's one small change, and you're making a huge deal out of it.
Like Liate stated, You may not like it, but it is canon and has plenty of proof to back it up.
EDIT: Also, waterarms isn't even a official move.