You guys are making no sense, if there was a stamina bar you would complain about running out of stamina.
In fact, there will be a stamina bar in the future but the physical activities that consume chakra right now are supposed to consume chakra because they surpass the normal human limits. Right now I can understand the confusion though, because there is no visible feedback of chakra usage when performing these activities, but very soon you will see blue chakra leakage whenever you run above 50 km/h and whenever you jump high.
Regarding the chakra consumption for jutsu, each jutsu has an individual consumption for holding and for using. Not distinguishing between these two is not logical. Real-life scenario: imagine jogging to warm up and subsequently sprinting, do you think you would consume the same amount of energy for both? No, sprinting would burn up more carbohydrates.
As I've mentioned earlier, each jutsu has a very individual consumption for both of the aforementioned parameters. Holding a chidori in your hand consumes a lot more chakra than being ready to initiate fire breath, henceforth the idling chakra drain of a chidori will visibly reduce your chakra bar. However, the idling chakra drain for being ready to initiate fire breath will only visibly make chakra recharge slower, it will not make it drain because the idling consumption rate for fire breath is actually smaller than the regular rate at which chakra recharges.
It is also possible to configure a jutsu to have no idling chakra consumption, but this is highly unrealistic because every (or rather most) jutsu requires preparation, and this preparation phase consumes chakra albeit much less than the actual attack.
Finally, GLT is a jutsu that is capable to do 600 damage (3x the damage of a Chidori). GLT also has a speed coefficient of 0.5, which means that if you were to hit someone at full speed, you would do 150% of damage or a total of 900 damage. This means that hitting someone at full speed with GLT will reduce 90% of their total health, an extremely powerful jutsu in other words. Something as powerful as GLT needs to come at a price, this price is both a high chakra consumption rate for idling with it and a high chakra consumption for using it.
Needless to say that all of the current jutsu are for testing purposes only.
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