You are falling victim to the everything has already been invented line of thinking. There are plenty of things still needed for agriculture. Some of them just require thinking about turning the industry on it's head.
For example no one likes Round-Up, people are not big fans of GM crops, one of the reasons we GM crops is the make them Round-Up resistant. The big player in the space has no incentive to change due to the fact that they own the IP to round-up and they own the IP to the GM crops that can resist it.
But what we are really talking about is getting rid of weeds. They way it is done now leaves a lot to be desired. A way to fix it is automated machines with object detection that eradicate weeds. Primary problem solved, weeds are gone, secondary problem solved Round-up is not needed and as a bonus not buying GM seeds.
The problem is no one is looking at it from that equation because either they have a vested interest in the current order of things or they do not have the technical chops.
That is just of the top of my head there are thousands of problems to address in the agricultural space.
I mean there are pest problems.
There are water management problems.
There are pollution problems.
There are yield to market problems.
Anything that has a workflow has potential improvements.