It is a great mechanic because it makes you use your brains. Adapt to certain situations, observe your surroundings, plan ahead then execute, change strategies midway, all of that is exciting and rewarding. In comparison, using the same tactic and battle style in every encounter is definitely a much safer way, but it gets dull after a while. Also, one major gameplay focus in BotW and TotK is the survival in the wild aspect, which would have been thrown out the window pretty fast if Link's growth progress wouldn't be pulled back by the breaking mechanic. You're not supposed to play it safe in these games. You're supposed to be on your toes when you're out in the wild. Being vulnerable is part of the thrill.