I have the impression that something else is being forgotten in this discussion – namely how she presents herself online, how she speaks and writes (!). She uses bizarre words over and over again ("exquisite"), seems to have a frighteningly limited vocabulary and is effectively unable to summarise and critically evaluate the books she claims to have read.
I am not saying that she put no work or effort into her degree, I am saying that it's sincerely a complete mystery to me how she achieved her grade. I've thought about many scenarios over the past few months – a paid ghostwriter for her essays or her dissertation? – and I simply cannot explain how such a huge gap between her online persona and her academic achievements has come about. But I do think it's fair to question and also criticise exactly that.
I get your point, but I do think again, spoken word, especially on a video, is going to be very different to an academic essay.
When writing, I’m sure she uses thesauruses, which will boost her vocab and make sure she’s using the right words, while as for critical evaluation, you can find essays and sure she rephrases that or adds her own spin.
Academics are a game; the brightest person isn’t necessarily going to get the best grade, but the person who plays the system the best.
on another note: I think it's unhealthy to encourage long hours of studying. I can't remember how I studied when I was a teenager. But I did an apprenticeship (this kind of system more of less only exists in Germany and it's basically you work full-time at a company and train to be something, whatever the job is, and go to school 2 times a week, but this differs from the kind of apprenticeship. This takes 2 or 2,5 to 3 years (depending on a few things) and you earn money during this time. and the end there are exams, practical and theoretical) my mid-20s (which is late btw. in most cases, you are 16 to 18/19-ish, depending on when you finish school etc.) and had to learn a lot of stuff. I used memorising techniques and flash cards and my husband/then boyfriend helped me by quizzing me. Later, I did my "Abitur" (it's like A-Level) at a school for adults. I never could study a whole day nonstop. I always took long breaks. I had no study ritual or set a timer or crazy things like getting up too early to start in the middle of the night.

The same goes for university. I like to write things down by hand, with an actual pen on actual paper. Sometimes I print texts to annotate them (okay that was before I bought my new iPad with a pencil). At the time I started university I started watching videos from Ruby and other "studytuber" and felt a bit bad for my lack of discipline when it came to learning. But I also think it gets more difficult with age. I think that I can't concentrate enough any more. But that can also be due to the access to devices like smartphone, tablet and the distractions through them.
Everyone has their own learning strategy. Maybe there are some who can study for hours straight. But the most of us, I guess, aren't able to to that and that is okay.
This is the problem that’s been discussed with Studytubers for years and it can apply to all of them. Yes, they may be good for motivation or tips, but they give unrealistic expectations of what’s required for impressionable teenagers.
Take Ruby’s degree grade for example: a 76. That’s an outstanding grade for anyone, yet Ruby said she was disappointed with elements of it and wanted “a high first”, especially for her dissertation. That is so problematic as not only does the numerical figure you’re awarded not matter in the slightest, yet people starting uni or even those far off it will go in thinking that anything not close to 80 is underwhelming or not good enough, which is so far from the truth. I know we all have different expectations, but that’s just unhealthy. A first is a first, end of.
As for it being unnecessary to do such insane amounts of studying, of course it is. If you enjoy it, fine, but Ruby paints herself out as some genius and someone who loves to study, but the truth is at her degree yesterday, there were 100s of students who got a first like Ruby, but didn’t devote half the time she did. They likely went out, socialised with friends, were involved in societies and so forth. Exeter has a beach only about 20 minutes by train which all students flock to; do you think Ruby has been there once?
These people who have done more yet have the same grade will have gained so much more: more personality, more life experience, more confidence and more of a social life. Ultimately, they will be 10x more employable with half the work.