TC3 I'm just generally frustrated that there isn't more consensus on piano pedagogy. That's part of why "get a teacher" never strikes me as helpful as people mean it -- there's no guarantee that your teacher really knows what they're doing, and as a student there's no great way of knowing. As a bit of an autodidact, I prefer to expose myself to as wide a variety of ideas as possible, then apply them via lots of trial and error and see what moves me forward.
Just some thoughts based on my own experience. I started self studying for one year, then took weekly lesson from a teacher for the second year. About a few months in with my teacher, it dawned me that the true benefit is I am being guided to follow a chosen path without straying off.
In my first year, I watched a ton of videos on learning piano by various YT teachers, many of them accomplished and convincing. I also read a few books, and follow the Faber book studiously. It all helped. However, sometimes the advices from various source do not agree. I did try to figure out what works for me, with limited success and not too clear understanding.
In my second year, I find myself rarely watch those video anymore. Because I have a teacher who I can ask, discuss, and get practical explanation and reasoning that fits well within the technical methodology that he is teaching me. I begin to understand although there can be multiple paths to lead to proficiency in piano playing, chose one and stay on it is the most direct way to advance. Jumping between multiple paths can be confusing and counterproductive.
Another benefit, which I think @ShiroKuro also alluded to, is a teacher can make the seemingly "impossible" possible. Some of the technique I am being taught may appear unorthodox at first glance. But when my teacher demonstrate the same technique at a high level, it lends confidence that it really works. Some of the pieces seems way above my skill level. But when my teacher breaks it down to manageable chunks and specific ways to practice, it gradually comes together. If I am still self-studying, and try these techniques/pieces, I'd most likely either give up and chalk them up as things to do in several more years.