Great question -- bought mine used and it had one on there already, but always wondered if I should swap it out with matte. And of course, no definitive answer out there so love to see other people's opinions on this topic.
To be completely honest, with the speigen you can’t even tell it’s there. At all. It is a perfect fit and the alignment tray is honestly foolproof. My 7 year old could have put it on perfectly.
My concern with no protector is how vital the screen is to this car. It’s everything. If I scratch the protector I can take it off snd try again. If I scratch the screen (or my kids do...) it will be replacement only abd that’s a fortune I’m sure.