My ES, who is 13, uses a PC in school for much of his writing as his handwriting is so appalling. He wrote some notes to help YS, who is 8, yesterday and my YS had to come to me to ask if I could read ESs writing as he couldn't!
His spelling is brilliant but his punctuation is non-existent - he doesn't leave spaces between words, use commas, capitals etc. hence the use of the PC!! Sentences just come out as a continuous line of ill-formed letters! His school have said he will be allowed to use the PC when it comes to GCSEs as he has 'set a precedent' by using it now.
However, should we really be getting him to practise writing by hand too, as he won't be able to fill in forms [eg] in future using the PC unless they are all supplied for him.