On a certain level you're right, but in practice you're mostly wrong. There is nothing exotic about the electronics found on the average FPV drone, but hobbyists today rely on being able to buy (e.g.) integrated electronic components such as flight controller boards and video transmitters, as well as purpose-optimized components like cameras, motors, and so on. All of these components are much smaller, lighter, and better-performing than the bodged-together setups that were used in the early days of the hobby (e.g. repurposing wireless security camera gear for video), and losing access to them will have a very real effect on what can be built and flown.

Source: I've been flying R/C aircraft of various types for over 30 years. Last year I built, I think, at least 7 FPV drones (a mix of fixed wings and quads).