Yes, it was. iPhone X onwards for the top/pro models were steel until the 15 Pro series switch to titanium.
The last “top” model aluminium phone was iPhone 7.
According to Google:
“When a polished titanium case is scratched, it often reveals the underlying, lighter "bare" titanium color, contrasting with the polished finish. While titanium is a tough and durable material, the polished finish on the casing is less resistant to scratches than the material itself.“
This aligns with my intuition and is why I chose the white iPhone Air this year, with silver/natural titanium rails.
It’s a head scratcher for sure. I’d love to see in the coming weeks that the black iPhone Air’s polished titanium edges is resistant to scratches for those who go caseless as I’d probably prefer that model.
I don’t know what they did with the X/XS steel edges but they were literally scratch proof in my experience but no other models before or since have had that effect unless they were the white/natural variants being case-less.
The aluminium pros in both orange and blue will suffer, without a doubt. But I fear the black Air will too.
I feel that there is very little risk now with going case-less and without a screen protector - the final boss is the metal edges, especially on the coloured/non-silver models.