Im actually not a fan of just saying 'well dont use it'. I enjoy trying to do things as efficiently as possible. Ideally i dont mind if harvesters are the easiest farms, if they are less efficient than multifarms. So it balances out. Harvesters can do cotton and stuff like that, so they are pretty handy.
I have always just disabled the crafting of the MFR fertilizer machine, harvesters are a lot less OP then.