All of those solutions are more resilient than microdrones, computer vision, and laser. These high tech solutions require a long global supply chain. They don't make them as robust as as they used to. Further, having multiple, redundant pest management systems means that when one of them fails, they won't all fail.
just like how if a house is overpriced and real estate investors believe it that doesn't mean there's going to be adequate downward pressure (in expectation) to prevent an unlucky family from overpaying on the house. (there is upward pressure, though, because of house flipping)
and since entry into the agriculture industry is pretty steep, it's not like anyone who has an idea can just build a farm with a cool robust idea that is more optimal than the current solution.
the other difficulty is the extensive time horizons to implement the solution suggested by hosh. farmers can't just drop everything they're doing this season, implement regenerative ag ideas today and reap the benefits come harvest this year.
it's the same issue with organic. transitioning to organic is a time and cost intensive process for farmers (it can take a few years to be fully certified). only a small percentage of farms produce organic even though it commands a higher price.
edit: added this year to end of paragraph 4
More mechanical contraptions also have a long history, and do actually include lasers: https://en.wikipedia.org/wiki/Bird_scarer#Lasers
But most pests are rather microscopic. I doubt we will ever construct silicon/metal hardware better able to operate at the level of, say, spores than the biological systems that are natural to that environment.