The problem with reactions is the necessary decision making can be both difficult and unrewarding. Knowing a turn in advance what will be relevant and how to counteract it isn’t easy and pre-planning is often undermined by changing circumstances.
Unlimited reactions means changing circumstances matter less. It achieves this by removing the decision altogether rather than adressing pain points. This gives players less to do and less to care about. If that’s what you like, fine, but I was really hoping decisions in BG3 could be both plentiful and meaningful.
In conclusion, a quick exploit: unlimited reactions effectively turn Cutting Words into an aura effect with the worst UI in the world. Have fun clicking thirty times a turn to target everyone within 60 feet.