“It’s been confirmed today in two new supply chain reports from China that Apple’s iPhone 15 Pro will indeed replace the existing stainless steel frame with a titanium alloy frame.”

TL:DR: who cares.

On one hand: Cool, titanium is strong and light weight!

On the other hand: Titanium can be brittle and Apple knows this from experience.

TLDR; no one will notice a darn bit of difference, stainless steel is probably cheaper and stronger in the ways that matter for a ~6” phone with glass panels that will break before either of those materials, and really how does it make any usability upgrades in any meaningful way?