Spend medals early on or save them?

[EastX]

I've reached Chapter 3 so far, which means I have only unlocked the 50 medal gacha.
Is there any reason to save medals for whatever comes later, or should I be pulling a lot right now?
Will medals eventually become scarce or unfarmable?

[Stolio]

You can spend all medals early you have more than enought to complete all non faction gachas with medals that can be earned once.
Once you complete all missions on standard or elite there's a chance a special rare boss mission appear after winning a mission. These special mission can give 1000 or 2000 medals to complete faction gacha.

[William Shakesman]

Over the course of normal play you will accrue more than enough medals to platinum EVERY unit except for the faction gacha generics which are a huge medal sink (And you'd only ever want those for fanatical completionism.). Every unit you would WANT to use you can get to plat without any issue. The only time you would want to save is if you are about to unlock a gacha tier and want to quickly crank it for some new units. Otherwise, feel free to get everything to plat. The stats will help you push further and several 50 medal gacha units are core even up to late game.

[EastX]

Thanks, guys!

[PIMPSwaG]

Once you unlock R . SR, just spend everything on that tier (most of the units in that tier will carry you through the whole game) because you'll eventually unlock everything from that tier. Then after that save as much as you can for the final tier. Or spend a little bit more on the default since some of those default units are complete beasts after they've unlocked 4 star skills.

[Macavity Omega]

Another thing to note, is you don't need to worry about overshooting platinum units, the game will hard lock any unit that CAN plat from being pulled, when and if you have enough pulled to make a given unit platinum. Even if they are gold, if you have the requisite "materials" from pulling to make that unit plat, that unit is permanently excluded from ever being pulled, and will never overshoot the requirements.
After you get EVERY unit that can be pulled to be able to be plat'd for a given gatcha, that gatcha will also be locked, since there's no point in pulling any more.

Unfortunately, the game isn't so graceful about getting enough materials for starring units. Still gotta grind those mats out.

[Fraggoth]

Originally posted by Macavity Omega:

Another thing to note, is you don't need to worry about overshooting platinum units, the game will hard lock any unit that CAN plat from being pulled, when and if you have enough pulled to make a given unit platinum. Even if they are gold, if you have the requisite "materials" from pulling to make that unit plat, that unit is permanently excluded from ever being pulled, and will never overshoot the requirements.
After you get EVERY unit that can be pulled to be able to be plat'd for a given gatcha, that gatcha will also be locked, since there's no point in pulling any more.

Unfortunately, the game isn't so graceful about getting enough materials for starring units. Still gotta grind those mats out.

Yeah, having like a cap of 99 for given materials that keeps them from dropping and allowing other, rarer equip materials to drop more frequently would be a massive improvement. You'd still probably be inundated with Support Exp drops but you'd STILL have better odds of getting higher-rarity mats and not having them be wasted by low-rarity ones.