Yeah I personally found this to be a big part of the tactical and strategic challenge. It reminded me a lot of Pokemon where you have a similar challenge, of slotting "exposure to fighting" into a limited action and HP budget.

Edit: Now that I think about it, most turn-based games have this mechanic. It's almost an idiomatic balance/design decision in gaming.

Compare to Dota where support heroes have acquired more and more opportunities for assist gold/XP, it does in some sense make the game "easier" for the support players, but then the game is harder in other ways because now the supports are all way more farmed and dangerous than in older versions. It's the difference between controlling an army of many units and having to manage them all, versus controlling one unit and needing to work together within a team.