I know that this is a bit confrontational for Tech Log but I'm 68 and I thought all the anti speed brake dinosaurs were extinct.
They are there to be used - in accordance with the flying manual.
He may then re-extend the speedbrakes, if necessary. The landing gear may always be extended out of sequence to aid deceleration."
Good to see.
Re stall margins: a competent pilot would not be pulling a handful of speedbrake close to target speed.
Getting back to the question, yes, some types permit speed brake with flap some did not and there may be a max flap setting for its use. As has been said, on the final approach it is more likely to be roll-assist.