I don't know about you, but I often confuse the title with menu buttons because of the regular weight. For me, middle weight was better. Again, opinions may differ.

I see your point, at least regarding those windows that still have menubar
We will fix this problem?
Tbh I think I slightly prefer the old bold titles too. No strong feeling though.
Okay we can revert it :) This way or... the other ;)
The fact that the “classic” decoration is too tall also contributes to the window title looking like a label… the title bar should be thin as in old Ambiance.
If it were thinner it wouldn't have enough space for the same control buttons (minimize, close, etc.) we have in headerbars. While if the control buttons where smaller, they would look too small inside the headerbar.
Fixed by latest rebase
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Tbh I think I slightly prefer the old bold titles too. No strong feeling though.