> Is Finnish unusual in having a more homogeneous pronunciation?
AFAICS, I'd say yes, it is.
There are some dialects (way up north, and in the East) where stuff is pronounced differently, but that's so hilariously different that I think speakers of those dialects are themselves fully aware that the way they pronounce stuff, it oughta be spelled differently. And conversely, what with only the "official" spelling being taught in school, they automatically learn the "correct" nationwide pronunciation from that -- thanks to the "everything is spelled as it's pronounced, and vice versa" phenomenon.
AFAICS, I'd say yes, it is.
There are some dialects (way up north, and in the East) where stuff is pronounced differently, but that's so hilariously different that I think speakers of those dialects are themselves fully aware that the way they pronounce stuff, it oughta be spelled differently. And conversely, what with only the "official" spelling being taught in school, they automatically learn the "correct" nationwide pronunciation from that -- thanks to the "everything is spelled as it's pronounced, and vice versa" phenomenon.