I don't get the problem really ?
I won't say that its the right thing to do because everyone else does, or the best for you.
But it is still the setup used by almost every kiter: A fully sheetable depower attached to your spreader bar, and a fixed loop for occasionally use !
having tried all other different setups (locking bars and almost everything), I personally think the setup with a depower to your spreader, and a fixed loop, is the very best.
It is so widely used because of its ultimative freedom when in the depower only - you can stall the kite backwards, and fly it totally depowered. This is what most want to be able to, for total control.
And in the fixed loop, you are perfectly powered for doing special tricks/jumps - and as there is no chicken loop in the hook, it works so great and easy.
And you can always trim your fixed loop length to suit your personal trim, so you get exactly the amount of power you want in the fixed loop.
There is not time for adjusting the trim, especially not at competitions.
This is why quite long fixed loops are preferred by good riders - as they would be overpowered otherwise.
But what I was asking was - it sounds almost like this common setup is not good (for those answering to this topic at least...).
Reality is, that it seems to be the far superior setup for the majority of kiters.
Just wanted to say this - so you don't think you are totally "square" if you use this most used setup