Who said one size fits all? The SLA is an option for those who've been at this for years and still can't attain consistent profitability.
As for RT PA reading skills, comparing one's skills with another's is only one consideration. Another is how long it took each trader to achieve competence.
Every opportunity you attempt to make it sound as if back testing is the only way â it is not
Reading PA real time and correctly - is the only consideration when trading real time
How long it takes someone to get this,..., or not - is up to them
Nothing external will "speed" that up
RN