I noticed the screen time tantrums only when my kid was using the iPad long enough to skip a meal or to put off nap time or bedtime with it.. which were normal times for a tantrum anyway.
Because of this, and how she wanted to play on the iPad when she didn’t get her way with something… I understood she is trying to cope by using a device. It’s been nice being self-isolated and having this time to discover this. Now when she’s asking for the iPad I automatically know it’s time to see if she needs food, sleep, or cuddles/interaction with me. It’s made things easier in a way! But she is allowed a few minutes to play a virtual doll house/hospital/school game on the iPad in the morning sometimes and she also has a little time at the end of the day. I am comfortable with this much use.