[kungtotte]

Nim disallows tabs entirely, and in Python 3 it's an error to mix the two in the same file. So those errors can't happen anymore.

Out of your list, the only one that seems like a real problem is recreating blocks if the code lost all formatting.

[lylecubed]

You just described two errors that do actually happen and in the next sentence say those errors can't happen anymore. What am I missing here?

[kungtotte]

The comment I replied to was talking about errors arising from mixing tabs and spaces and incorrect indentation levels that arise from it.

If a language either disallows tabs entirely or will refuse to run/compile code that mixes tabs and spaces in the same source file, you obviously can't get errors related to mixing tabs and spaces.