I dont understand your point? You do know that convertibles have roofs, right?
Got a link?
I think it is because the wife does most of the shopping.
I had sort of understood that the usual maneuver was to hold the bra with the clasp in front, connect it, and then rotate it around the right way forward. Though on thinking about it, that might just be for ones without shoulder straps.
It’s harder to close the hooks when they’re in the back. It’s more doable to fasten it this way, but then you can undo the hooks while the bra is on the right way around.
I think there are two types of people who wear bras, those who can fasten them in the back, and those who fasten them in the front and twist them around and then put their arms in.
Each group thinks the other is wrong.
I’ve switched around groups over the years for no reason that’s clear even to me.
Part of the reason for hooking it in front and then twisting around is to um, “fill” the cups by bending forward and then pulling the bra up by the straps. Thus endith the TMI and hijack.
That’s what I do unless I do a pullover my head bra(sports bra) or none.
I hate the damn things so much I ain’t worrying about it more that 1 minute per day. If it causes pain I’m not ever gonna do it.
Enough with the bras 
I support that argument.