No but if any striker struggles to score in most other ways other than headers and tap ins it massively limits there use to the team.
Say we get to a cup final and draw a Man City where we know at best your talking 3-4 chances at goal we may have - having someone who isn't clinical upfront (I dont include tap ins as clinical thats just good positional play) massively impedes your chances of nicking a result.
Im not saying he's crap im just saying Ancelotti has worked with some of the best strikers of the game and if the clubs ambitions are realistically to win trophies and compete in the champions league against the likes of Real Madrid, Dortmund, Juventus we are going to need a striker who only needs 1 chance to score in any scenario be it 1 on 1, taking on a defender and beating them, tap ins, headers etc.