As one spinner can bowl 40 overs in the day there is only really need for one, so as seamers can bowl less in a day there is a need for more of them in the side.
Trying to bowl 90mph is a lot more exciting than spinning it.
Also bowling seam is easier as you only need a basic action and at an early stage wrist position is easy as it can be adjusted at start of run-up and doesnt need to be twisted in the action so less things to do/think about making it easier
Trying to bowl 90mph is a lot more exciting than spinning it.
Also bowling seam is easier as you only need a basic action and at an early stage wrist position is easy as it can be adjusted at start of run-up and doesnt need to be twisted in the action so less things to do/think about making it easier