Thanks for the post and for the pdf as well. That is one I didn't have.
I agree the F1 crowd are regressing but I think the FIA is much to blame.
ANY attempt at progress seems to be blocked by them altering the regulations and it appears to me this is one of the main reasons F1 is falling from favour.
That rant aside the mirror placement at the roofline would be no less convenient than where it usually is now.
That position was originally determined by the need to manually adjust mirrors so they ended up being around arm's length from the driver.
With power mirrors now standard fitting any fitting location can be easily covered so aero may be the deciding factor if there in fact is some advantage to having them elsewhere.
Cheers , Peter.