"Efficient" in terms of what outputs, for what inputs?
You can't just handwave the term as a synonym for "I think it's better!" - it actually does imply inputs, outputs, and depending on what you want to optimize for, you may get very different results.
If a scythe is genuinely better for the job than a sickle, great!
But in a country without a lot of infrastructure and without modern supply chains, I'm pretty sure a tractor is the wrong solution to the problem. Unless, of course, your problem is "how to burden nations with loans they will never be able to pay back so you can come in and take over."
Imagine a farmer in a region that exclusively has manual laborers gets a machine that makes a hundred laborers' already meagerly paid jobs obsolete. You now have a hundred angry unemployed laborers and a prime suspect.
Yes, this is exactly what the Luddites were about (iirc). But you can't just barge in and make people's jobs obsolete. I'm sure even the scythe is seeing resistance because it can make a single person do the work of three others.
That said, something needs to be done to improve quality of life and reduce poverty. There need to be a lot more better paying jobs in the global South, but it seems that only China is willing to invest in e.g. the infrastructure required for that.
You can absolutely jump economic steps. Many countries never got wide deployment of wired telephones, and never will. They skipped right to wide deployment of mobile phones. Many of those same countries skipped right past desktop computers in every home and laptops to replace desktops and have gone straight from limited computer access to the mobile phone replaces desktop computers.
You certainly don't need to hit all the economic steps, but using capital to reduce labor doesn't make sense when labor is much less expensive than capital.
You could but you might not have enough money to send enough tractors and infrastructure to have as big of an impact. If you were optimising for impact you might find that Scythes are a better return on your investment.
Working in the field is difficult, yes, but the western world still hasn't figured out an answer to the question "what happens when we run out of dead dinosaurs[1] to eat?". Until it has, any idea to not exacerbate the problem until we figure it out is, in my mind, a good idea.
You can't just handwave the term as a synonym for "I think it's better!" - it actually does imply inputs, outputs, and depending on what you want to optimize for, you may get very different results.
If a scythe is genuinely better for the job than a sickle, great!
But in a country without a lot of infrastructure and without modern supply chains, I'm pretty sure a tractor is the wrong solution to the problem. Unless, of course, your problem is "how to burden nations with loans they will never be able to pay back so you can come in and take over."