It's a group decision, if one person's gear, skill or willingness to speed run is lacking, it just isn't going to end well. I personally think it is fun but in DF you don't know what you are going to get so pulling huge groups just to die b/c the dps can't AOE down before cool downs run out, tank doesn't rotate cool downs maximally or the healer has their head in the sand just isn't worth it time wise. So I don't insist on it or get upset if someone in the group doesn't want to do it. (As a tank I'll still chain pull group after group as long as the healer mana is good)
The other day I was berated extensively as a healer because I wouldn't help a dpser push our tank to do a speed run. The tanks gear was fine for it but it wasn't their main job and they weren't comfortable with it. It was quite funny seeing the dpser tell me how horrible I was as a healer because I was dpsing a lot of the run instead of healing exclusively (no one died but him and that's because he didn't hide on Fenrir b/c he was too busy yelling at me) I guess he really didn't want to go faster... He just wanted a speed run lol.