I felt the same. Very quickly we had less pace/intensity and mobility there and it allowed West Ham much more space. They attacked down that side more as soon as Enzo came on.
I love Enzo and at sometime were going to have to utilise the quality on the ball and in the final third he has, but I totally understand why he isn't going to start whilst we find our feet - I'm still not sure he's got the physique to excel at this level.
We shouldn't change against Burnley apart from Alderete. Our midfield allowed us to swamp West Ham and overrun them 2nd half. Le Fee should be used as opposition legs tire at the moment.