Give me original and cohesive commentary on this using a critical straitforward informal tone and make sure it's very detailed and include all infos with a similar length to the provided text: trainees are overtrained and it hinders their skill development.

most people seem to think the rigorous training system that requires you to sacrifice your health is necessary to produce highly skilled idols and that a lot of trainees are unable to improve their skills because it's really hard, and not because the system is poorly designed.

i am specifically referring to the fact that trainees are made to train/practice for hours and hours every day to the point where they sacrifice sleep to spend more time in the practice room. i've seen a lot of idols and former trainees talk about how they would practice until like 3 am and then wake up early like 6 or 7. this is an active hindrance to skill development. while it shows dedication to practice for hours every night and sleep for only like 4 or 5 hours, this is literally actively going to get in the way of your developing your skills no matter what you're trying to do and this is doubly true for trainees who are children and teenagers and likely require anywhere from 9 to 11 hours of sleep every night.

in order to develop any skills but especially physical skills like dancing and singing (this is a physical skill - you need to develop physical muscle coordination) you need to be in good health physically. you need to be getting enough rest for your body to be able to recover from what is an extremely taxing experience.

with the level that trainees are likely at, they are comparable to beginner or intermediate students. at this level, voice practice is recommended to be only 30 minutes to an hour a day. dance practice is recommended to be like 1-3 hours a day. when you start going over that amount of practice you start over training. practicing to the point of exhausting is bad. even professional singers don't practice for more than like 2-3 hours a day because it's too much for your voice, but i've seen countless idols talk about how they would practice until they lost their voice. this is horrible because it literally leaves you too tired to learn. both physically and mentally.

there's a phenomenon of post practice improvement where you actually get a lot better at the thing you're learning after the practice period is over while you're resting. this is because the brain continues to process even after you're done, so whatever technique you were practicing gets strengthened and solidified as you rest and sleep. trainees don't get to do this because they're overtraining and losing out on sleep. sleep and rest are literally critical to learning new skills. mentally and physically you quickly reach a point of diminishing returns with practice and that's the point at which you just need to take a break and rest.

also, honestly, this amount of practice is genuinely overkill. i've seen teenagers improve far more with way less practice and way less time. like, if you put a 15 year old in weekly hour-long voice lessons, they'll have a solid grasp of basic voice technique after 6 months to a year. meanwhile there are idols coming out of this insanely rigorous training system barely being able to stay on key when they're smack bang in the middle of their vocal range. this isn't even unusual, by the way. this is the average. most people will be good enough to have like a solid octave where they're comfortable and can reliably stay on key and sound pretty good.

there's a similar thing with dance. i've seen some terrible dancers i know take recreational dance classes weekly for like a year and come out of it looking as good as some idols who trained for hours every day. i think the overtraining and giving up sleep thing is genuinely holding trainees and idols back. if they were able to get enough rest (for which i am blaming the companies and their ridiculous overworking culture) and practice for a more reasonable but still rigorous amount of time, like a total of 2-4 hours a day for both dance and vocals, it would improve their lives but it would also improve their skills. it's literally a win win situation. i just don't think it's going to happen because the overworking culture is so thoroughly engrained in south korea and in kpop.

I also think a part of this is also that trainees don't actually get good instruction. i'm basing this off of survival shows which is maybe not the best representation of what goes on behind the scenes, but the trainees seem to get a lot of criticism but not too many helpful pointers. like, they'll get told they aren't hitting a note when they actually need is advice on is specifics on how to adjust their oral posture and breathing so that they'll be able to hit the note. the "teaching" will be like... "stop using falsetto!" and then they just repeat that instead of actually teaching them how to use the head voice instead or something.