Don’t mention the hundred different engines out there, along with somethings you can do with one but not the other, so you have to research all of them. Also, you may have to install more stuff to get the engine to do other things you’re used to as well.
In this analogy, no car dealer sells a Linux car and you’d have to rip out the engine yourself at home if you wanted one.
That’s the perceived barrier to entry.
Don’t mention the hundred different engines out there, along with somethings you can do with one but not the other, so you have to research all of them. Also, you may have to install more stuff to get the engine to do other things you’re used to as well.