I think of it like:

  everyone :: deals          everyone :: scripts, tools, small apps
  lawyer   :: contracts           swe :: high value software

People do informal deals all the time, work off loose understandings, fire off standard forms etc.

When there are disputes (incidents), lots of money and risk involved, that's where you want a lawyer. I think SWE will stick around as a craft but I genuinely don't know if it will be more or less valuable.