Although the megapixel fetish race is the one that gets the most attention, I think the ISO equivalent is also pretty amusing (in a "shakes head, looks baffled" kind of way).
Now, I should preface all this by mentioning that I don't have a "genre" of photography. I just photograph whatever attracts my attention at any given time, and that can be day or night.
Recently I saw a camera review in which the reviewer was showing pictures captured at ISOs that would have been considered witchcraft even ten years ago. They looked like garbage - noisy as anything and generally an aesthetic mess. But apparently the fact that they were taken at stratospheric ISO levels means that the whole world must see them because, I don't know, reasons.
Although I've used cameras that are well known for good high ISO performance, a look through my Google photos collection shows me that I almost never go beyond ISO 3200, and I would guess that less than 5% of my (tens of thousands of) photos are shot at that sensitivity. On a usual day, I find that if I have a fast lens (F2 or quicker), I can get almost anything I want to shoot without going past ISO 800, or 1600 in a pinch.
I'd be interested to hear from people who do use these 5-or-6 digit ISOs on a regular basis, and what they shoot that necessitates these ISOs. Let's hear some thoughts.
You sound like a pretentious prick. I'm not demeaning you, just letting you know how you sound in case you want to change it in the future.
You sound aggressive and presumptuous. I'm prepared to stand by my statement.
Go on then. How do you "learn lighting" in an environment you cannot control?
I'm prepared for you to think that I'm a prick and not take any of my advice, but your post history tells me you're perhaps a beginner so if you'd like to learn anything, I have a track record of very happy clients that I wear on my sleeve (or rather, link to on my profile.) I'm happy to share my experience.