And have each semi final showcasing one genre - for example kids and comedians, put one of each through

Next semi final to be dance acts and magicians

and so on

A lot fairer???

yeah that would be good. only problem is they put way too many singers in for that to be possible.

if u look at the 45 acts they started with, i think half of them were singers and a quarter were dancers

Five different categories - Singers, dancers, then what? I doubt they'd have 9 impressionists to put through for example.

better if the categories were singers/dancers/variety - 2 shows each, and 2 from each show get through

If one episode was just kids it would be a bit...bleh. The whole point is showcasing a mix of different types of acts. That's what makes the show so watchable IMO. Categories would ruin it.