1) you dont need to be so perfectionistic about that kind of stuff, off course all english dialects shuld be represent, but not in an exact way; thats the best that as been done
That's exactly my problem with this orthography: They should've aimed for a supradialectal, morphophonemic orthography and instead they ended up with an overspecified jumble. (Who says "human" with [æ]? Or "reason" with [ɔ]? That sounds overpronounced in such as way as I'd expect from a non-native speaker.)
2)but if we try to do it historically we wil have un nesessary letter, letter that arent used in the leanguage and letter with weird shapes, keyboards will be a mess!!
Who says? I'm not saying we should revert to Old English orthography or anything. I'm just saying that sh
works fine for the language, has for centuries, has close parallels in Dutch and German sch
, and so forth. It's not broke, so why "fix" it?