I'll just add that I've never missed reactions in previous D&D games that use older rulesets. BG1, BG2, NWN...
Yeah, well, no shit. They weren't turn-based games to begin with and reactions weren't a thing in that system.
The equivalent of a "Counterspell" back then was interrupting a caster in real time with a physical attack or something like a Magic Missile.
And less spells requiring concentration.
Concentration is something that exists with a very deliberate design purpose: to prevent "pre-buff stockpiling" from becoming a thing.
Like in Buff Finder: Buffmaker and Wrath of the Buffer.
"Bounded accuracy" is a thing for a reason:
https://dungeonsdragons.fandom.com/wiki/Bounded_accuracy