No it isn't. Few years ago I had a month old new shape Suzuki Swift. They fitted a oem screen as the was all that was available. What honked me off was that they couldn't recalibrate the camera brake assist gubbins. So I had to pay the main dealer to do that separately. It was only the second one they'd ever done. So in summary not a mass market brand and a very new model out, they fitted an oem screen.

I wouldn't worry too much about minor chips for the mot. The rules are changing this year. Currently the test is to check a prescribed area of the screen for cracks and chips of a certain size. The new test is a visual impairment check, which means is there a good view over the bonnet, forward, and up towards the sky.

Some years ago, I sat in the driving seat of a car whilst a chip was being repaired. I was surprised at the amount of pressure the repairer put on the screen, presumably to make sure the sealant went right into the hole. I could literally see it moving in and out in front of me.

As an aside, when I left and got up the road a little way, I spotted someone looking at a map. He was in a car with smashed glass in the passenger side door. Assuming he was looking for the repair shop, I stopped and offered to help. He turned out to be a rep looking for his next call. He told me he'd been driving with his window open when a van coming towards him passed so close and fast that it took off his door mirror and propelled it across in front of him and through the glass in the passenger door.

A rep told you someone else was driving too fast and too close and you believed him?

Where did I say I believed him?