well, then let me be the first to call bullshit on that one.
5e is a bland enaugh system as it is, Reactions are one of the few good holdovers from 4e and they should be in.
the lack of reactions actually annoyed me in OS2.
Why not just make em like overwatch in xcom
I know about TB games like The last remnant or Mordheim where you had several reactions that you can use in the enemy´s turn so It is possible. Also desirable.
Mordheim is even a MP game too, so that is not an excuse.