Health is a currency is one of the biggest lessons I took out of Slay the Spire (the gold standard for deckbuilder roguelikes and game that I was recommended once by someone in an interview for a non-game related position - and I was the interviewer).
In contrast to most RPGs with good public healthcare (this was meant to be a joke but I just played Dragon Quarter and healing in that game is decidedly Not Free), where health is more like a fuel gauge (topped up at all times), Slay the Spire demands that you know when and how to spend your health as if it was a more traditional consumable or currency (of which you also have to plan carefully).
Maintaining health is good, but at the end of the day, finishing with 1 HP is as good as finishing with 100 - so know when to use it and when to prioritize other opportunities over it.
