Any company that has a product built on recurring payments will always tend towards becoming predatory in the money they need to extract because #1 they need to have pinch points to ensure they get money at regular, predictable intervals since they're a business and #2 because there is absolutely no reason for them not to turn the dial up on the micro-transactions -- up and up -- slowly until the profit gained is cancelled out by the quitting players.
If I can make one suggestion -- hold your resin replenishment items until level 40 or 45. You will get better drops for artifacts from dungeons later on (5* artifacts) and being able to replenish your resin will then allow you to go on a mega grind to farm them if you so wish. That's more or less the only major mistake I felt I made with my resources, I did have to go grind a bit for exp/gold but never felt like it significantly gated me. The only major gating that is sometimes a touch upsetting to me is having to wait a day or 2 from a domain in order to get that item you need to upgrade a weapon.
Trying not to bomb you with dumb questions but does gold ever become rare? I feel like I have so much gold and nothing to spend it on.
Yes you'll use absolutely all of it when you increase your world ranks and will probably need to do the veins on one or two days in order to get some more. At some point or another you will run out of just about every single resource you have and need to go and earn some more of it. The only resource I have never run out of are the upgrade crystals for weapons which the game seems to just liberally throw hundreds and hundreds of unnecessary ones at us.