I know that I annoy the combine drivers sometimes and often the changes I suggest have caused other issues and have to be partially or totally reversed. I know I am opinionated and I drive one of the combine drivers mad, so much so that now and again he will tell me to feck off and start drawing grain, From stubble to stubble I will have an opinion on every operation, from ploughing to cutting. When I have someone in sowing I decide whether I want a disc or onepass, I decide the rate and check the depth it is being sown at. When I get Fert spread I decide the rough date, the product and the rate, and if I can be there I like to see the spreader working to see if the product is being spread wide enough, but not too wide.
And the same with the cutting, I am involved in every decision made and have an opinion on every aspect.
While I understand that there are very good combine drivers that know more about setting their machine than I do, including both the main drivers here, I still go back to a person walking beside a working combine can tell a lot to a good driver. I know I am OTT, but I couldn't open a gate into my year's work and say "do best can" and walk away.