I think I also agree with Rols comment about the lack of money. I'm not bothering, because I'm not upgrading my gears, but really asking 500 rupees for every piece of clothing upgrade in the last level is evil. You will need 80k rupees to upgrade them all. Many of those gears need your most reliable resource of money, which are gems like diamonds and rubies
I don't even think I have reached 15k even if I've played for more than 150 hours, and that was selling tons of opals, amber, sapphires, etc
I remember in BOTW I bought all the gear I wanted without troubling much with rupees. Here the only armor I have fully bought is the Gerudo Voe set, because Link looks cool wearing them
Be a completionist in this game might be a nightmare...