This isn't true starting in the 70-75 zone just outside of Orr and in the Orr zones. Every mob has a snare / pull / immobilize / some sort of CC. Getting full completion in those zones by myself (literally no one else was in those zones with me at the time) was a huge PITA. Killing mobs becomes much slower at higher levels and the solo respawn rate is ridiculously high.
Warrior Longbow is an AOE weapon. Yes it's designed that way and no you can't treat it like a single target dps ranged weapon (that's what a rifle is). That said, I think they made a huge mistake with weaponization. You now choose your weapon based on what skills have been pre-defined for each one rather than choosing skills for your weapon. They could have made the game much deeper if they allowed more skill options per weapon.
You had trouble exploring at level 70-80, gosh that's a long time to wait to start having a hard time exploring solo. That's the last 10-15% of the game, I'd say the other 85-90% is explorable fairly easy compared to the original which was much tougher to explore without runners or being in a party.
I do agree with your thoughts though on th weapons based skills, I think the original GW skill system was nearly flawless and this one leaves a lot to be desired. I'm guessing they changed it to make their lives easier, people continued to find skillsets and weapon combinations in the original that constantly required nerfing or rebalancing. It seems they went the easy way out this time and made it easier for everyone but took all the thought out of choosing your skills which I really hate. I had a lot of fun thinking about skillbars and weapons in the original.