If you're using https://genshin.gg/tier-list for anything but quick references to character talent, and other game information, then you're doing it wrong. Their build guides are ass, unless you're in the beginning game, and their tier list is garbage, as it assesses every character, in a vacuum, which is completely opposite of how the core game mechanics operate. Also, the resin system is only an issue post AR35, as if you haven't actually explored everywhere, you still have plenty of stuff to do, none of which need cost you a dime. If it wasn't there, many more people would be AR 40+ and completed everything, complaining they don't have any content. The game is only three weeks old, so if you have bleed the content dry, then ya, you won't have much to do ATM, and you'd have still played a more complete game than most AAA company games.
Admittedly, the game has drawn in a lot of people who have never seen a Gacha before, let alone one attached to this type of game. All I can recommend is to try it, and see what it's like, and don't spend anything until you know you enjoy it, which is completely doable.