I have mixed feelings.
When my eldest son was five, we would play checkers, and I would beat him each time. At that point, I wanted him to feel good about himself if he won, and I wanted to challenge him rather than creating a false sense of competence.
But sometimes the response for a child faced with such terrible odds is resignation and indifference, and I saw that happening. He responded a lot better when I played just above his skill level; it would leave him feeling as if he were improving (which he was) and encouraged him to try again and again, and feel good about how he was doing.
Eventually we reached days where I had to work hard to not lose.
And then came the day when I tried and still lost anyway.
So, speaking from a coach perspective, I think it's valuable to set goals appropriately, and it's not always the best approach long-term to just plow over the unskilled; most people seem to become demoralized rather than inspired to try harder.
However, this situation is a little different. The winning team is not comprised of coaches, they're compromised of those who are still being taught; so it's not their responsibility to make these decisions for the other team.