From what I understand, untreated steel is much softer, while 316L used in most watches are harder. When measured in Vickers, I see that PT is 125 vs mild steel is 130 vs 316L steel is 155, which is nearly 25% different.
1) color mismatch (not that worried as the case is brushed and the PT and steel don’t look too different on the Panoretrograph PT case vs the GO Panograph 21mm bracelet 2) steel (if it’s 316 or harder) being harder than platinum may have the endlinks grinding against the softer case. This is my biggest concern 3) galvanic bonding between the different metals, but I’m not too worried about this
I also do like the GO bracelet which has been lauded and has good microadjust capabilities. I’m also a big fan of bracelets in person and was hoping to find a solution.