doctorbadwolf
Heretic of The Seventh Circle
Yeah you play a different game from any I’ve seen irl.Cordon of Arrows is available at 5th level, trading one of the ranger's two spell slots for an effect I would easily allow with a tripwire and a couple of crossbows. It deals up to 4d6, which is bad for a 2nd level spell in general, but even worse at 5th level, when the damage is nuisance level (on top of making me roll up to 4 saves). If it was a ritual, it would be OK, but as is, it's weak.
Hail of Thorns uses concentration, as you note, making it automatically downgraded. It deals 1d10 in a 5' radius, which is pretty mediocre. It (and really all ranger spells in early game) are competing with Hunter's Mark, the class feature disguised as a spell that also unfortunately uses concentration (as does pass without trace). Middling damage, tiny radius, no secondary effect, concentration... what more could you want to throw it in the garbage pile?
You often have 4 crossbows in your pack?
It’s a no-concentration spell that you can set up before a fight, and it just works, no further fuss required. While you’re dealing full warrior class damage on top of it.

Hail of Thorns doesn’t deal 1d10 in a 5ft radius, it deals that on top of an attack action.
Concentration doesn’t downgrade the spell, all spells that add to an attack as part of the spell do.
You seem to be comparing ranger spells to full caster spells, rather than the result of a turn of actions of a ranger against the result of a turn of actions of a full caster. This will lead to false results, because it isn’t a valid comparison.