I think Smith's unwillingness to experiment with formation has meant we haven't been in games as much as we could.
The 433 is all he knows and likes, but it only works if the team is on top and willing to play, you can't sit deep/play on the counter 433, and we ended up trying because we couldn't get hold of the ball. When we were in bad form performance-wise, we were such a total shambles.
The 343 surprised Burnley and we got a good win, then never really did much beyond that in the league. I don't think Smith ever wanted to do it but had to try something after Watford away, his insistence on three up front was silly bearing in mind our lack of quality available. Now we're back to 433 against Leicester who absolutely ripped us apart playing it last time. We'll need to up it from somewhere to have success with it again, it often left in midfield and 5 up front.
A 4231, 352, 3412 would all have been worth looking at.
Personnel he was given made this season's job very difficult.