Earlier quoted context omitted.
He had a keyboard with important keys on both sides of the spacebar because the assumption was that a user would interact with the computer in sophisticated ways such as or similar to programming. Most current keyboards are designed for cost saving or consumption or just by copying mediocre designs that are common.
I write software for 20 years, I use Linux and OS X as my primary development desktop OS, I have used Slackware Linux 1.0 back in 1995, I am a touch typist — but I just can't stay using Vim or Emacs, unless forced to (such as when I have to quickly edit something on a remote machine). Yes, I might be a special snowflake — most developers don't have problems with vim or Emacs, expect for occasional flame wars between…
What I like about Emacs is that I can use it with just about any programming or semi-programming language I come across without having to learn a new IDE or editor. The other thing I like is that the capability ceiling of the tool is so high that I am constantly making significant progress in terms of efficiency. So the cost of learning it, was and is worth it for me. If I was writing Java or C# or Pharo most of the time, I'd probably uses different tools.