This further devalues the main conviction – and players should, in theory, choose the main conviction in more than half of the cases. It also devalues the medic skill, and consequently, the need to somehow establish team interaction.
Easing this restriction would be quite conditional from this point of view.
Moreover, a false sense of security will most likely lead to us taking more risks. And the warnings from the GM (which, in this expedition, were, in any case, more frequent than in the past, even if we forget about the cat mechanic) will probably become less frequent, and we probably won't encounter characters like Yukino with trade-off offers for healing anymore...