My life has improved after I started getting up extremely early (0400) four or so years ago. And that doesn't happen without an alarm clock.
My point is not to say that you are wrong but that we might be better off trying different solution for ourselves instead of believing in authorities here or elsewhere.
(I'm not saying you shouldn't listen to normal advice like getting good sleep etc, but don't think that getting up at 0400 will solve your problems because eitland says so and don't think that waking up naturally will solve all your problems. Instead try one, then the other if the first didn't work.)
I think the most important point is not so much that you should never use an alarm (I do regularly), but that if you're unsure of whether you actually get enough sleep, it is worth finding out how much sleep you need, and ensure you get it, whether by adjusting your bedtime or your alarm time, or ensuring you compensate every few days.
Too many people don't know how much sleep their body would want if unconstrained by alarms. Once you know, you can get decent results of manipulating when you get that sleep with alarms. But if you don't know it's very easy to be near constantly sleep deprived.
The most interesting pattern I observed in my sleep is the integral patterns associated with it -- it's nearly impossible for me to wake up after less than 3.5 hours of sleep[1], and then after about 4 hours of sleep it becomes difficult again to wake up until after about 7.5 hours, when I usually wake up on my own, and then after around 8 hours of sleep if I oversleep you're probably not seeing me until I've finished a solid 11 hours.[0]
It's extraordinarily useful for planning when I am not getting much sleep. If I must be somewhere at X o'clock, and I can't get a full night's sleep for some reason, I make sure I am going to sleep so that my alarm starts going off when I am at around 3.5 hours of sleep or so. I've missed too many meetings and flights trying to get 5 or 6 hours of sleep. And if I've just pulled an all-nighter and need to be somewhere in 2 hours, I don't go to sleep unless I have someone who can literally kick me awake at the appropriate time, 'cuz nothing else is going to get it done.
[0] Yes, I've read enough about sleep to know most of the details behind such sleep rhythms.
[1] Well, having children does change that a bit, but a beep-beep-beep isn't going to get the job done.
I recently did a stint of waking at 0500 to work on my side projects. This was a big transition from waking at 8:15 and hitting the sack after midnight. But getting the important stuff sorted early and having such a consistent routine, including a bedtime routine was intoxicating. Since moving and being in complete lockdown Ive returned to my old ways for various practical and also disfunctional reasons but I look back at my structured early-riser days with envy. I guess I am a morning person after all. Many years of distraction and lack of direction trying to be productive in the evenings behind me. It wasnt ADD it was just not the right time of day! This is coming from a 30 year old.
I've done the same and also reverted, but found it easier in summer (no fear of getting out of a warm bed, plus earlier daylight).
That said, I get by on little sleep and can be productive in the evenings when I know I have more time available if I get on a roll. Wake up at 5am and parents inevitably have kids up and distracting them from 6:30. Work at 9pm, and you can carry on until 3am or longer without distraction.
My life has improved after I started getting up extremely early (0400) four or so years ago. And that doesn't happen without an alarm clock.
My point is not to say that you are wrong but that we might be better off trying different solution for ourselves instead of believing in authorities here or elsewhere.
(I'm not saying you shouldn't listen to normal advice like getting good sleep etc, but don't think that getting up at 0400 will solve your problems because eitland says so and don't think that waking up naturally will solve all your problems. Instead try one, then the other if the first didn't work.)