I'm not sure it is. This is probably something that could actually be calculated. Assuming the primary failure mode is compression of the tab, rather than failure of the frame/liner or the stop pin, you'd compare the crush (I think the steel geeks call it 'yield'?) figure for the Ti to the steel, taking into account depth and width. I wouldn't be surprised if the steel was stronger, even though it is thinner but that is a pure guess at best.