In a certain way, it does feel close. We can’t figure out how to go faster than light, but we could theoretically get to a significant fraction of c and 20 years isn’t such a long time to plan for in terms of getting a probe there to start relaying messages that take 20 years to get back.
I mean, it’s the span of a career, but people could conceivably work on the launch and live to see it return data.
I wouldn’t do a mailing list these days, but as someone who spent the early part of my career interacting with devs that preferred this method, it’s actually pretty ergonomic by a 2005 standard. A message thread aware, text based email client that can turn messages into patches in a keystroke makes it actually pretty comparable to modern code review…
I think it’s hard for younger devs to get this because they’re used to email being stuck in a crappy, unthreaded browser interface or Outlook etc. (which are terrible for mailing lists) and most collaboration taking place in code review and chat platforms like Teams/Slack but for decades before these were feasible, email was the way…