Extreme? That's standard jrpg game design. Jrpg design is built on scarcity. It's a genre about resource management. That is the game.
Really...? Not to Rhax my way into an argument, but can you name more than one JRPG released in the last decade and a half that was actually hard and required resource management?
JRPGs are, imo, cheesecake as hell games that I turn to. Persona 5, for example, is this easy ass game on its hardest difficulty and I hang out with my bros for useless stat boosts just to see the character interactions (of which, in the OG, there were almost none). Dragon Quest & most Final Fantasy games are just about introducing a bunch of variety into your mash X games, same goes for all other JRPGs I've played.
The only JRPGs I go to for difficulty and resource management are SMT games up until the release of Persona 4.
So many years have passed that I can't honestly think you believe that you think JRPGs are hallmarks of level design/difficulty/resource management. There are vastly more years/games that point to the contrary.
I mean, even old JRPGs are only hard because of savepoints and jank encounter rates.
What I described is the classic DQ formula.
Decade and a half? That means quite a lot of rpgs.
Off the top of my head:
Valkyrie Profile 2
Final Fantasy XII
Souls series
SMT games (DDS1&2, Persona 3, Strange Journey, SMT4)
Bravely Default
Ys games
Etrian franchise
The Last Remnant
Resonance of Fate
Monster Hunter games
Radiant Historia
Infinite Space
Dragon Quest IX
Devil Survivor
Valkyrie Profile: Covenant of the Plume
Final Fantasy Tactics A2
Knights in the Nightmare
Shiren the Wanderer (granted ds port of sfam game)
The Dark Spire
etc. etc.
Haven't played it but Labyrinth Refrain is a recent game that interests me.
You also can't mash X in Dragon Quest unless you grind. DQ isn't hard, but it ain't mindless either.
This is a really bad take. Jrpg are my former squeeze.
Thinking jrpgs are a cheesecake genre and I hope you're not offended by this, shows a fairly limited exposure to them.

Also thinking the old ones are challenging just because of lack of save points is also funny given in FF1 NES you can save by using a tent. It's all about resources and choices.
Again reminding me that just because someone is an FF fan doesn't make them a jrpg fan.
Finally, I never said make the game hard. Just engaging. I'm not even saying every rpg has to be hard. Playing through Super Mario RPG right now.
PS: I find the whole "why limit resources?!!?" thing extra comical when the original FFVII already made some resources, such as ethers, scarce.