To reiterate once again: the spell is bad (as most other ranger combat spells) , but the ability it replaced was even worse.
Again Volley is way better than Conjure Barrage by a lot.
Downcasting Conjure Barrage is cool. But it is
weak. Ranger's already get Hail of Thorns that
does almost the same thing and that spell is also weak.
The ranger was strong. "Fandom" in "loud voices" or optimizers think it is bad.
The ranger was "strong". It had a ton of exploits. Conjure spells. GWM/SS abuse stacked on Hunter's mark. Dipping into rogue or fighter easy.
So even if the numbers are not correct now, at least the chassis works much more seemlessly.
Numbers can still be balanced.
Seemless doesn't mean strong.
You were not supposed to stack buffs in 5e. That's the whole point of Concentration.
People wanted to stack buffs because the ranger was weak and if you stacked Hunter's Mark with other spells, the class would feel strong. Concentrationless Hunter's Mark is meh because Cordon of Arrows and Hail of Thorns, the spell that don't compete with Hunter's mark anymore are bad.The Good Ranger spells, Swift Quiver and Lightning Arrow are "high level" for rangers.
Concentraionless HM means every combat heavy ranger will be spamming Conjure Animals, Enchance Ability, Entangle, and Pass Without Trace because there aren't many other good ranger spells. That's not going to get annoying for DMs.