I have nothing whatsoever against SP. I am merely explaining why many children don't learn to read English easily, even with SP.
I pasted in the 300 key words before, but the most crucial of those are the 100 that make up half of all the words in children?s books.
The 43 phonically not totally regular ones among those (in descending order from the most frequent) are:
he, I, of, the, to, was,
all, be, are, have, one, said, we, you, by, my, call, before, come, could, do, down, into, look, me, more, now, only, other, right, she, some, their, there, two, when, want, were, what, where, which, who, your.
The 57 decodable ones are:
a, and, in, is, it, that,
as, at, but, for, had, him, his, not, on, so, they, with, about, an, back, been, big, came, can, did, first, from, get, go, has, her, here, if, just, like, little, made, make, much, must, no, new, off, or, our, out, over, see, them, then, this, up, well, went, will, old.
I think it is pretty easy to see why the latter are much easier to teach and learn than the first.