Its a 5e core rule, spells is generally more powerfull, but the draw back is, you can only ever have one spell with concentration active... thats why finding the passive spells life false life, or other spells that dont have concentration is a puzzle, sure its not for anyone, and i can agree it is at time anoying, but pros and cons... it sorta got out of control in 3.5 when you stacked spell effects in absurdum, then the game turned more into a spread cheat how to stack your bonuses most effective...
I was sceptical at first like you, but the more i play the more the system grows on you...
