I understand the need to add challenge to the game, as well as mix things up. The way the market is going, I also understand how freemium games inherently add paywalls. Despite this, I think FFBE added challenging boss fights which could be overcome with planning and friend units. FE:H has difficult events which can be overcome with good tactics and strategy. Reactive Armor, Taser and Unstoppable Force are none of the above. They're just obnoxious.