> profitable work for a set of people

I think this is essential to the disagreement in this little part of the discussion.

Ending a product line and laying off the people who worked on that product line aligns more to your "profitable work for a set of people" phrasing. But a great deal of tech sector layoffs happen as a blanket action, not targeted at specific products, teams, or roles. Business units are directed to find X% to cut. When the business is making money, these blanket actions can feel pretty unfair to the affected employees. The decision to lay off any specific individual could be completely disconnected from the value that individual provides to the business.