Yes, if there were other good quest rewards that you could take in lieu of seeds, then seeds would be less of a junk mat, that'd be a tradeoff and create opportunity cost
If seeds had other uses, they'd be less of a junk mat, that'd be a tradeoff and create opportunity cost
But that's not the case in the game. Right now they're a junk mat, and so they dont correspond to an opportunity cost.
And you're right, this idea would create another use for seeds and thus make them less of a junk mat...but the problem is your argument becomes circular. You're justifying making +1 hearts available for seeds because it has an opportunity cost, and you're justifying the opportunity cost by saying they're now usable to buy +1 seeds. Seeds need more things to buy, but it cant be something as inherently valuable and otherwise difficult to obtain as a +1 heart. You need to start by creating options for seeds that arent so powerful and valuable that they need the opportunity cost justified. Then you can weigh that opportunity cost against larger and larger alternatives.
How are +1 LR Hearts "powerful"
They would basically just exist to make a grindy option to actually use Iconic builds, and to clean up 1 level mistakes.
You're equating powerful with convenient. Telling.
But why not add Epic Hearts, Iconic Hearts, Blood Hearts, Wood Hearts, +1 LR Hearts, and +5 LR Hearts to heart seeds at various denominations.
People would blow through their stacks pretty fast if they're on the TR train... and then the grind to eventually TR gets wrapped up in basic epic questing.
There is really no downside. You keep pointing out ways that this suggestion makes all your points better, but then argue it doesn't do enough on its own.
Well... no single suggestion does that, typically, does it?