Apart from the players being too slow, and too soft, there appears to be be no one in the side who can head the ball. These observations are far from new, and I doubt, very much, if anyone would find them contentious.
All that all our corners, and all our crosses, do, is give the opposition defence practice, quite a lot of practice, actually.
On the other hand, and related directly to our ineptitude in the opposition box, when our lot have to defend a corner, it's heart in mouth time, and Gawd help us if a cross comes from open play.
A lot can be laid at the feet (and heads) of the players, but, really, the coaching and tactical planning, and work, must be diabolical.