First, asymptomatic carotids. Asymptomatic carotids are never an emergency. Someone that tells you otherwise has some other agenda. Also, ACAS is outdated, yet it is the quoted literature for justification of operating on asymptomatic carotid patients. The reality is, we don't actually have good quality data with modern medical management to say one way or the other. It is pretty well accepted in part of the stroke neuro community to have a hard and fast 'no intervention' stance for any asymptomatic patients. It is a strong enough held belief that depending on where you train now, you may grow up in a culture of never operating on asymptomatics. We have one faculty (out of 15) who is this way. So, the range of perspectives is, this is never an emergency to this should never be done.
Second, DAPT, I certainly can't speak for all vascular surgeons, but I never stop DAPT and will operate on just about anyone if necessary. I would like to stop it if it is unnecessary to continue (which happens from time to time that someone will show up in our office and they just haven't seen their cardiologist in a while, but if someone is supposed to be on DAPT for whatever reason, I will bite the bullet and operate on them. It is simply a part of life as a vascular surgeon. Yes, it bleeds more and yes, it is sometimes painful, but it kind of is what it is.
Third, coronoary optimization prior to urgent surgery. I've looked fairly exhaustively at the literature over the last several years as this comes up quite frequently. And as with everything, I think that this is a big, "It depends." I'm convinced that if we are expecting the potential for serious hemodynamic shifts, the heart needs to be revascularized prior to surgery. Certainly not backed up by level 1 data and hard to quantify, but I have a hard time taking someone back with known hemodynamically significant, albeit asymptomatic cardiac lesions.
Fourth, I'm sorry, but you should not be revascularizing legs that you don't have good expectations of limb salvage. The comment of, "In all likelihood the leg is going to come off eventually anyways." Is either naïveté or a product of fairly shoddy local medical practices.