This is true, however, it comes from a more primal and instinctual place than most people know, or would like to admit.
I could write an entire dissertation on this topic but I will do my best to truncate it as much as possible, and I will apologize in advance if anything comes off more crude than it seems it should. In addition, I will make it clear, I in no way condemn OP’s choice of learning method and am glad OP found a way to progress at their own pace. As an atypical learner as well, I know how hard it can be to find your own path.
The primary problem is the result of someone saying something along the lines of, “Don’t allow people to gatekeep you from doing anything.” “Or nobody should let the opinion of others dictate how they choose to direct their own learning,”
Now these type of statements, on the surface level, do not seem that big a deal. However, humans are amazing creatures with insane instincts. Most people would never be able to explain why there is a problem with these statements. But instinctually, they know something is wrong and when a human instinctually knows something is wrong but intellectually does not know what or why something is wrong; they tend to have and create a great many misunderstandings.
So, why are statements like these a problem? It is because when you take these types of statements and bring them to their logical conclusion, they are brought to a place where most people will agree is terrible, horrific and unacceptable. Now I need to preface, I do not think 99% of people who make these statements are even considering these ends nor do I believe they endorse them.
However, the logical conclusion these types of statements end in are things like: there should be no laws, I can commit any level of horrendous acts and no one has any right to “gatekeep” me or “dictate how i choose to direct” my actions, and a whole host of other societal problematic conclusions. And as a society we have deemed these things unacceptable, so many people get combative to protect the societal good on an instinctual level. While, at the same time, not being able to correctly identify the necessary intellectual reasonings.
Now many, at this point, will want to say, “But hey we are just talking about learning a new language, none of that applies here.”
To this I ask, what would you say if someone came in here and said, “Hey guys I found my best way of learning is to torture myself when I get something wrong. You guys should try it to. It works super well.” This is also an end case of “no gatekeeping.”
Now many will point out, “Hey of course we wouldn’t condone that. That is outside of common sense so that doesn’t count.” However, the problem is not everyone is on the same wave-length. Not everyone is of the same mental capacity. And the problem isn’t even about the here and now.
Like I said already, humans have an insane instinctual understanding and instinctually humans know; given enough time and freedom, the logical conclusion WILL be reached. And it will happen in small, unnoticeable increments. Humans have already dealt with this type of problem many times over and over for our entire history. And that is the instinctual reason people push back on these types of statements.