[wodny]

I think this is an oversimplification. Just look at the number and the history of PEPs:

- The Theory of Type Hints - PEP 483

- Annotations - PEP 3107 - 3.0

- Type hints - PEP 484 - 3.5

- Variable annotations - PEP 526 - 3.6

- Postponed evaluation - PEP 563 - 3.7 (3.10)

- Core support - PEP 560 - 3.7

- Distribution - PEP 561 - 3.7

- Data Classes - PEP 557 - 3.7

- Literal types - PEP 586 - 3.8

- TypedDict (limit keys) - PEP 589 - 3.8

- Final qualifier - PEP 591 - 3.8

- Static duck typing - PEP 544 - 3.8

- Flexible annotations - PEP 593 - 3.9

- Type Hinting Generics In Standard Collections - PEP 585 - 3.9

[travisjungroth]

Almost all of those are additive changes. PEP 563 is a breaking change.