I might sound mean in saying this, and if so, I apologize. I'm being far from it. But it would seem to me that anything less than the answer you might want equals spam, yes?
Again, I'm WELL aware that it's a popular sentiment/method among the community. Believe me, it's not the first "popular" thing I so openly hate. And while I'll still help friends to run content I might dislike, they know where I stand, and they know better than to try to force me into anything. I generally don't and won't tank roulettes (ESPECIALLY High Level, even though it's easy - again, reasons I won't share because I don't have to), and if asked to, I'll politely suggest that they consider someone else instead. If they insist or if there's really no one else, then they understand they will NOT be speedrunning. I will not be speedrunning. It's not a matter of efficiency or comfort, it's my firm boundary I set. Party members either respect it, or they find another tank. No argument, no confrontation. It's purely a path of least resistance, and IMO, rather sporting of me to be upfront about it.
DF, I understand I get what I get. And the choice is ALWAYS mine. If I don't want to SR, I can happily eat a timer and feel nothing for it. Or if perhaps I'm with a friend/someone new, suck it up and deal with it, but I'll openly admit the cold silence and mechanical DPS/healing that would come with it is both an obvious and tense showing of my disapproval. I usually won't even stick around for comms/loot. Again, purely my choice and I'll exercise it any and every time. Popular opinion be damned.
Again, not trying to sound mean, but this is me after having dealt with the "Mythflox" gold rush and all the good and bad of it. It's not that speedrunning is a "bad" tactic, but that the forceful, all-or-nothing, "anything else is boring" approach to it IS bad. When people are excluded/kicked from duties purely for not being part of the "optimal" party setup, yes that bothers me greatly, even if I myself have never had that happen to me (I haven't). When tanks - new tanks - learn that it's what they HAVE to do or they're bad tanks, and never learn or never get the chance to learn that there are other ways to perform their role, I have a HUGE problem with that. The speedrunning itself isn't a problem. The fault lies in the perception and accepted status quo that "anything less is boring" (pure opinion), "I just want to get it over with because I've done it so much" (a personal matter), and the biggest one, "efficiency = speed" (true in some ways, but not absolute). Fact is, if you force any particular play style on others, you're already trading in efficiency for a selfish satisfaction.
And all this, I've said before. But if that's what you needed to satisfy your curiosity, then I consider this a good deed done today.