The problem is, Guild Wars 1 was instanced and Guild Wars 2 is open world. So the more interested stuff has to be in dungeons. You can’t have mixed mobs respawning in the open world, no matter what players want, because far more players will be annoyed by it than players who want it.
Take a look at the krait. Anet made the krait harder and afterwards people complained. Look at AC. Anet made the dungeon harder and people stopped running it.
In an instanced game, you could make stuff hard, because first of all, no one was ever alone. You had henchmen with you and later heroes. And so you always fought in a group against groups.
You can’t really give everyone five or six henchmen in the open world, because if you do, you could end up with 12 guys together and you have an army of sixty. It wouldn’t work. You can’t have different professions healing each other in the open world, because one guy might not be able to do much against that, and how is that fair to him. Maybe someone plays at 3 am and there’s no one around. You were never alone in Guild Wars 1.
Guild Wars 1, in the later years, was far easier than Guild Wars 2 is now. It was complete yawn mode. People don’t remember, but things usually appeared in the same place. You pretty much knew exactly there this group was going to be and pretty much knew exactly how to tackle it.
Sure there were challenging runs in Guild Wars 1 (like the Droks run). Except it’s not challenging at all with a full party once you know it and have the right build. It’s only fun/challenging with a smaller party. You’ve changed the rules of the game.
So do the same thing here. Test yourself. Take off half your armor and then try the Cursed Shore. Try to solo a veteran karka. Try to run the Grawl tunnel in Frostgorge.
The last many years of Guild Wars 1, the game was so easy as to be unplayable. Those who fondly remember the Droks run, or the hydras in the crystal desert, are remembering a point in time.
Very often there are harder creatures and groups in dungeons in this game…but people don’t want to run the hard paths. They’d much rather repeat CoF path 1.