Don't get me wrong...my criticisms of the Hannah TBT are legion, but is there anything intrisically wrong with analysis by intention to treat?

When we look at Home Birth, it would skew results massively if we only looked at outcomes for those who actually gave birth at home and excluded those who ended up transferring.

When we look at attempted VBAC, it would skew results massively is we only looked at outcomes for those who were successful and ignored those who ended up having in-labour CS.

Similarly, if you look at "planned vaginal breech delivery" you have to include those that end up having an in-labour caesarean section, because otherwise your figures make no sense. Of course, you might also want to include sub-group analysis for those that were successful and for those that were not. But bad outcomes for in-labour breech CS might be attributable to attempted vaginal breech, might they not?