Yes, you are right! But, you know, it is Android 5. It has a market share of 1.6%. We can talk about this cool new feature in ~3 years, when everybody has Android 5+ ;-)
if you're setting up a kiosk, you'll need to get a new model anyways.
You're probably getting something cheapish, though, which almost certainly won't have Android 5.0, and will likely _never_ have it.
Not necessarily true, you can often get an older Nexus device quite cheaply and then upgrade the OS. That's how I got my hands on Android 5.0 -- and it really transformed an old and tired phone into something new and marvelous.