Languages drift, true. That's why you need spelling to follow, or else it only gets worse until all benefits of using an alphabet are lost.
Just do the occasional orthography cleanup every couple of decades and keep the old spelling around as deprecated until it's gone. If shifts in regional accents aren't perfectly consistent it's no big loss, their evolution will still be less inconsistent running on top of a of a non-fossilized standard orthography than without those cleanup efforts.
What obvious reasons do you see for English? Russian might be a language with a central authority claiming total control over all speakers, but both German and Spanish are 1:n in the relationship of language : state.
Just do the occasional orthography cleanup every couple of decades and keep the old spelling around as deprecated until it's gone. If shifts in regional accents aren't perfectly consistent it's no big loss, their evolution will still be less inconsistent running on top of a of a non-fossilized standard orthography than without those cleanup efforts.
What obvious reasons do you see for English? Russian might be a language with a central authority claiming total control over all speakers, but both German and Spanish are 1:n in the relationship of language : state.