Tantrums and wobblers are normal.
Children lack the necessary understanding of the world, for example, object permanence.. whilst a 2 year old understands half their biscuit is gone and they now grasp that if something is out of sight it may still exist but be hidden they DON'T understand how that biscuit has now turned into mush and is inside them... cue strop because now the biscuit is no longer whole...
They don't have the communication skills, nor do they have the ability to tolerate frustration adults do...put those things together and of course you get upset ranging from quiet tears to outright meltdown.
My sister and I were raised the same, borderline abusive smacking, left to cry it out, expected to speak like mini adults, no baby talk...
She would tantrum like the queen of tantrums, I remember an epic when she was 5, because she had tried to hold her breath (something she did a LOT when much younger) and she couldn't do it any more...
I apparently didn't do tantrums - I suspect I did, just not the epic level of total crazyness she'd do (she threw her ski poles at a bunch of skiers aged 4, fortunately someone stopped her as she was about to take off her skis and throw them too. The gathering crowds crime... one of them had laughed at her...).
I was more the 'go away and cry by yourself' type. She was the 'fling yourself on the supermarket floor, flail around, scream, snot, then go rigid, then go blue and floppy' type.