If I need to do a thing and a product I use can’t do it? Why should I buy it? Does Linux have the software support of Windows? The hardware support?

So what argument could you give Joe Normal about how Linux is better than Windows ?

That's a fair argument as to why someone should use windows. What does that have to do with quality though? You are confusing two things. Whether you should use it or recommend it is not the same as whether it's good quality.