oh my god ok i dont mean this like the odds are better, but singles pulls help you control the number of gems you use to reach the mandatory 4 star thus saving gems over time https://twitter.com/dilwc/status/1320129362419544064

pulling 10 at once and pulling 1 at a time wont increase or decrease your chances, but pulling singles can help save gems bc u dont need to pull 10 for your next 4*, you cn just reach the number through single pulls

eg: you do a 10 pull and your 5th pull is a 4*, you just need to pull 5 more times to your next 4*