True strike is also a concentration spell, which means you can’t use any other concentration spells and you have a chance to waste it if someone hits you.
It’s also “advantage on one attack roll”, meaning it has no effect on spell saving throws like Fireball, Ray of Frost, etc.
There’s just a huge opportunity cost of taking it when you only get a few cantrips for the whole game
I’m not saying “True Strike shouldn’t exist”. I’m saying as it is, it’s incredibly underbalanced and not worth spending two turns to cast one spell.
I’m all for build diversity, but if you want to guarantee your big spells land (you can still miss with advantage, btw) you might as well pick Divination Wizard and use a Portent. If someone wanted to use this cantrip and I was DMing, I’d adjust it to be more accessible.