It's really interesting because Rogues have been almost required for the meta comp for a real team where everyone is playing just 1 character. If you look at the leaderboards they always have a rogue due to their utility/dps they bring to the table. For us though it just doesn't pan out like that.

As the expansions go on it's similar to EQ, the mechanics of the boss fights get more and more complicated. It's just the evolution of the game. Anything up to lvl 60 will be basically a tank and spank fight, then they started adding more to it. It wasn't until I'd say WoD that it gets even trickier - then Legion expansion and now at BFA it's full blown mechanics mechanics mechanics for fights.
Doing these are 1 player - super easy. As a group - it's a bit of a cluster.

Additionally for your team of 4 hunters and a Druid - since your using the hunter pets as a tank I'm assuming I would go with a Resto Shaman, their chain heal bounces on the pets and keeps them up. It was an extremely powerful comp in Legion but pet tanks don't scale to that degree anymore in BFA (I've tried it
Not to say switch your comp, your first one, just ride the wave and enjoy. Also don't worry about the dungeons and missing things.
To note!! Vanilla dungeons (10-60) are actually harder than the next expansions of TBC or WoTLK. Going from one of the last dungeons in Vanilla to the beginning dungeons in TBC is a complete joke, the mobs have like a third of the HP and give triple the XP. It's been like this way for a while, so if you feel like they are getting too hard in a bit, don't worry they ease up.