I can see why someone might draw that conclusion after a cursory look.
I can emphatically tell you looks are deceiving. 5E has pulled off a very impressive feat: its magic system looks and feels much like 3E/PF, yet is comprehensively different under the hood.
The combined effect of Concentration, the way buffing is comprehensively changed, bonus stacking, the number of spell slots, and last but not least: how many many spells have tweaked parameters... It all adds up to a real sea-change. It really does fix 3E, and specifically the area where casters run circles around martials! And all without losing the soul of the game.
At first I was impressed. Then I started to caution y'all that this revelation might have gone past Paizo completely.
At this time I started arguing they're headed for disaster, since I suspect 5E gamers have zero appetite for the things we took for granted back in 3E.
And, yes, that includes loads of 5E gamers that haven't even considered the issue; people that think they aren't affected by any of the problems. (And as long as they stick with 5E, that's entirely correct)