I'm so late to this that the discussion has probably moved way past my first impressions, because you guys have had yours weeks or months ago. I'm probably coming from a slightly different place.
In the first video Dr. Gebrian begins with "our traditional practice culture": daily practice, "for hours and hours", and lots of repetition. She counters that with new ideas which are the topic here. In the 2nd video, it's the scientific side with synapses and neurotransmitters. You guys have all watched those videos so I don't have to say more.
Ok, where am I coming from? Quite some years ago there was a teacher - for me the topic was also remediation because I'd gotten into quite a mess with that instrument - who proposed very short practice sessions, pauses, and how things worked. I adopted these things, expanded, and learned a few more approaches - my practising has been different ever sense. The "hours and hours", repetitions, etc. have been foreign since almost two decades. Here is roughly how I learned things:
Actual full focus can only be maintained a short time, esp. if learning truly new things in new neural pathways. We may be focusing fully when we aren't. (a thing I discovered) Therefore the advice was short practice sessions, several a day, with generous spacing of time in between (sound familiar?). (In testing truly new things, full focus might only last 15 seconds, I found.) Changing the point of focus might lengthen practice sessions because you keep switching "what" you're practising.
I used to think of "little gremlins" or "little elves" busily putting stuff on shelves and putting up new wiring for the stuff that I "dumped in". I sort of had an idea about neural pathways, but liked picturing it that way. Taking a break, letting go, rather than ruminating and trying to mentally force things in when not practising, took a degree of trust. I pictured it as "not disturbing the little elves so they can do their job", but more realistically knew we can "get in our own way". An experience that can happen is that you're not thinking about what you were practising or the problem you're trying to solve - and it's like an old toaster oven goes "Ding" to tell you the toast is done; suddenly you feel you have the answer and by golly, part of it is there.
That's kind of my experience and what I learned. The present is similar. Some things that are different is that there seems to be a schedule or set of schedules. Personally I'd not like that, because of where I've been at for a longish time. But talking to some people, it seems that having the schedule is a thing they need. It does make sense, because if you have been in a routine of practising one way --- the "traditional system" --- having something else which is a routine too, to counter it, seems like an excellent stepping stone, and otherwise the feeling of chaos and lostness might make you give up before transitioning to much of anything.