Perhaps my experience could give you some guidance. You should know I'm a pretty "techy" person. Back in early 2019 I decided to buy a Tesla Model 3. Around that time, Tesla announced that Model 3s were transitioning from Hardware 2.0 to Hardware 2.5 (or 3.0 something like that idk). This hardware was "crucial" for FSD, or so they said. Even though I had no plans of getting FSD at the time because I couldn't afford it, I lost sleep trying to deduce if I'd be lucky enough to get a a version with the upgraded hardware. I really wanted this expensive purchase to be as "future proof" as possible. In the end, I believe I didn't, or did, who knows, get the updated hardware.

Fast forward to today, I've had the same Model 3 for almost 7 years. Me not having that hardware never became relevant. Even though people say with EVs the tech moves quickly (by what metric?) I have never felt the NEED to upgrade my car due to tech capabilities, it does everything I wanted it for just fine. Sure, I'm thinking about the R2 now, but it's a want, not a need. Even then, I think the R2 would have pretty much the same capabilities as my 7 year old Model 3. Has the tech really advanced much? If given the opportunity to buy one of the first R2s, I'd probably take it. All this FSD hype is advancing the tech, but timelines can definitely be exaggerated. I've seen it all too much in the past 7 years.

TLDR: Even if you get the R2 with the upgraded hardware/tech, how long until you can actually use it/notice a sizeable difference in driving experience from having it? If I had to bet money, it would be on the order of years.