If you can't modify the software (or have no concept of what source code is) these freedoms largely become meaningless.
I hear this again and again, and I think it's absolutely false. It's like saying
"I don't have the time to shop around for the cheapest product, so a market economy is useless to me"
In both cases the point is that even if you don't have the time or the knowledge someone else does, and only a small number of such people are required for the system to bring benefits to everyone.