I can maintain polite conversation.
The tire doesn't sing gospels when you put it in chains.
In a church you see pew, pew pew. In a mosque you hear pew pew pew.
Your erection....
So they don't accidentally roll out of bed.
Hardware breaks if you maintain it.
One costs a lot of money to maintain, keep running, and give you the results you want. The other has four wheels.