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Zephirine wrote:
I'll ignore the question about maps because I am not a mapper and have no idea about that.
There is no such thing as the "most important" AR. It all depends on what YOU want to develop. Some players like playing nomod in which case ar9-9.8 is what you would want to develop. Others like low ar HD so they develop ar 6-8. Some like to play fast and play ar9+ with dt (ar10.3+). Thus, the "most important" ar depends on what you want to learn.
It's not really a bad habit to jump from ar10 to 8 and vice versa. I jump from ar10 to ar4.6 dt a lot (I play EZDT when bored) and actually doing this has helped me get used to a relatively wide range of ar (in my own opinion). You can stick to 1 ar for some time if you want to get used to it. This is what I did with AR10. It helped me get used to reading ar10.
It's not necessary to learn it early on imo. Just focus on what you can do right now and improve little by little from there. If you are comfortable with 9.2, try aiming for 9.4 and then 9.6 and so on until you reach ar10. It's not something you need to learn very early on, but something you'll need eventually if you want to play hard rock.