I so feel the same way. Leaving reactions the way it is just makes everything completely different than 5ed.
Ignoring 5e entirely... The current reaction system is just flat out bad. Consuming very limited resources on a random automatic target isn't anyone's idea of good game design.
I don't know about that. I can understand why there are people who don't want to deal with pop-ups asking if they want to use this or that reaction.
Sure, but people who don't want to deal with reactions at all also aren't going to be picking reaction spells or reaction-heavy classes. Does anyone currently enjoy how Hellish Rebuke works?
At the absolute minimum it could be an optional prompt. If you just want to fire automatically? Set it and forget it, but let everyone else decide when to use them.