I'm on Void Linux right now running Nim 0.19 compiling the following code:

    when isMainModule:
      echo "Hello World"

nim c hello.nim:

Before strip: 113k

After strip: 92k

nim c -d:release hello.nim:

Before strip: 79k

After strip: 63k

nim c -d:release --opt:size hello.nim:

Before strip: 46k

After strip: 30k

Kind of a toy example but it illustrates my point. An unstripped version of the Nim program with full debug symbols is still 78k smaller than the stripped, release version of the Rust equivalent. But it's great that they're trying to work on this problem.