Because you need to give players the chance to prove their worth, and you normally do that in low risk games -at least on paper- like Bornemouth at home.
I get that but on the other spectrum we haven't had a settled back 4 in years and these guys just got a win and clean sheet at the Brittania vs Stoke, that's no easy feat.
Shouldn't they get the chance to continue to gel?
As it is, who would you play if we were playing against Arsenal at Emirates next week?