I hate reaction pop-ups in a video game. They pause the action at the absolute worst time just when a hit is about to land.
That's why I can support turning reactions into activated abilities, Free Actions or Bonus Actions you use on your turn. And since Larian clearly wants more BA's in the game...
E.g. Shield could be a 1 minute Concentration Bonus Action spell. You lose the precise reactivity but you gain more potential damage prevention and it would still be "fast" to put up.
