most crafted are outclassed by their BP version, depending on your stance you could argue that they want you to buy the BP instead (personally I think it's just a matter of gear progression, and the crafted stuff is still fine for most if not all stuff).
also any of the DPS swords is apparently still better for noelle, even with the DEF scaling, but can't remember the math exactly or if it was dependent if you got c6 or not
gatcha works by catching more flies with honey, but stretched over time so you come back every day. the only difference paying in genshin makes is the amount and level of chars/gears you potentially can get, which makes certain parts (retardedly) easier but isn't really required. if you spend your free gatchacoins (primogems) conscientiously, as in knowing when to roll on what and how much, you already can get pretty far.
if you just want to follow the story, afterwards grind a bit every day and do events free is more than enough.