This leads to weird bugs when you change indentation and miss a line or reorder lines. The logic changes. Not too bad when you’re on your own, as Python seems to be intended for. Add multiple developers and git merges and it is a recipe for disaster. With end tags at least you just end up with poorly formatted working code.
That problem happened because there was no way to travel from town to town quickly so if the clocks were off nobody cared. The trains changed that.