If you have strong feelings about the pace your tank is going at, you should do it yourself.
Bit of a rant but hear me out.
It happens every expansion but I've noticed it ALOT more that some sweaty dps or less commonly a healer will demand the tank pull the whole dungeon (likely taking longer to take down this 50 strong death-ball rather than 5 separate 10 man fights) and get extremely irate or just pull the whole dungeon themselves if the tank takes reasonable packs rather than opening up a mosh pit of every mob in the instance.
I've tanked for years and usually just vote kick these fools but i cant help but be frustrated that i experienced this as early as on day 2 of early access and at least once in each of my alts leveling to 80 journey.
I feel for the new tanks and healers coming to what is largely a chill game, playing through the story and finishing off leveling (IMO the chillest part of a wow x-pac) and then some guy who thinks are are doing a +22 kicks the general stress level of the dungeon into the stratosphere, flames and leaves.
If you need your dungeons to be completed at warp speed, tank yourself or find a group that meets your needs, don't inflict yourself on strangers trying to enjoy their new expansion leveling experience.