I think your english is just fine, you sure get your ideas across and they make sense to me.
I'd heard that the symbols were there to help people to latch onto an idea of what the symbols are meant to stand for.
I'd also heard that when Usui taught reiki, he taught by example and that just being in the presence of him, the student 'learned' reiki or became attuned.
This took a long time and so usui came on the idea of the symbols probably through long meditation.
The symbols are a short cut, and just as affective as the long
way of attunement.
I would also like to learn of how usui taught his students.
And how he attuned them also.
The way I have been taught is complicated to me, although probably more simplified, but I find that there are more symbols used than maybe are needfull.
But this is my way. And well maybe it's a long way, but there is no wrong way. I trust.
aloha