I think the big change has been in the autonomous navigation combined with the pre-assembled stuff that is really hard to crash unless you're trying. For a few grand now, you can get a more or less plug-and-play (or charge-and-fly) system capable of transporting a few pounds of cargo a dozen miles with a minimally trained operator and minimal assembly.
You could also use a big model rocket, but you can't buy a huge one off the shelf that works so reliably with little skill. RC subs would also be possible, but again, you'd need to do a lot of your own R&D, whereas companies like DJI now do it for you. Big RC helis have been capable of the same-ish payloads for a decade or more now, but they're hard to fly, hard to build, and require quite a bit of training to fly without crashing. You'd also need to be watching it every second in flight, unlike the self-stabilizing GPS waypoint systems which have become affordable (<$10k and available to non-military) in the past few years.
You could also use a big model rocket, but you can't buy a huge one off the shelf that works so reliably with little skill. RC subs would also be possible, but again, you'd need to do a lot of your own R&D, whereas companies like DJI now do it for you. Big RC helis have been capable of the same-ish payloads for a decade or more now, but they're hard to fly, hard to build, and require quite a bit of training to fly without crashing. You'd also need to be watching it every second in flight, unlike the self-stabilizing GPS waypoint systems which have become affordable (<$10k and available to non-military) in the past few years.