Lets just take a step back a little

Everyone's different, in all walks of life. Some pick things up immediately, others take longer. Heck that's if they have similar tastes in the first place

Some people do like speed runs in dungeons/raids, always have done. Sometimes (or maybe all times) it's better to do this with players you know or do it with your guild.

I think that if you go into a purely pug group expecting a speed run, you are open to rng You may get lucky, you may not.
Sure you can feel a bit disappointed if it's not happening, but that's the situation with pug groups. They can vary pretty wildly, but they are what they are. Always been this way in mmo's over many years.

Personally I'd much rather take the time to help out struggling players in groups - maybe this is just because of the old school approach of a long serving mmo player.

There where times I wanted to do a quick run. I'd built up a good group of friends through guilds that could do these.