I think the most annoying part about errors due to missing initialisation is that (especially with variables on the stack, so not those allocated with Malloc) t

I think the most annoying part about errors due to missing initialisation is that (especially with variables on the stack, so not those allocated with Malloc) they are coincidentally pre-filled with values from the functions that were called immediately before the current function. So instead of completely random behaviour you see somewhat random behaviour. And an off by 5 error is a lot harder to track than a off by several thousands error.