The only folks suitable to teach education about HTF and algo to retail traders are those that actually worked in the industry of HFT and algo instead of by someone that just happen to read informed articles about such.
Thus, that may be why today's trading educators haven't really addressed this issue. In contrast, I see this issue addressed in professional industry magazines that the typical retail trader doesn't subscribe to or doesn't have access to.
Simply, if you want to get schooled about this issues while trying to be a retail trader...its self-education. If you think HFT/algos is the only thing not addressed...many other things are not addressed and I don't think such should be addressed by today's typical trading teacher because the typical retail trader isn't interested in such until after the fact.
These types of retail trader should then just realize a trading teacher has limitations. In those situations, the retail trader must seek a different type of education involving those topics not being taught by the trading teacher.
Analogy, its like going to see a doctor for a foot pain. You then see him and he then sends you to a foot specialist. You go see the foot specialist and that person then sends you to someone else with more specialty if needed. I often wonder why all the middle man and why couldn't I just see the last guy first ?
Simply, maybe those you're questioning
should be recommending you to another source if/when they are not able to provide adequate answers about topics (e.g. HFT and algos) you're interested in about your trading. Just as important, its your responsibility to research these topics too on your own especially if you want up to date (current) info and not something from a few years back.