If even the tiniest backwards incompatible changes to the public API require a major version bump, won I end up at version 42.0.0 very rapidly?
This is a question of responsible development and foresight. Incompatible changes should not be introduced lightly to software that has a lot of dependent code. The cost that must be incurred to upgrade can be significant. Having to bump major versions to release incompatible changes means you’ll think through the impact of your changes, and evaluate the cost/benefit ratio involved.