strict type checking is an incredibly useful tool for cases when you really want to make sure your code is correct and behaving as expected (one of many tools).

There are lots of people who like python and want to use it for things that where incorrect code has serious consequences. Type checking is helpful in these contexts.

Type checking remains optional for the masses and is not practical in many cases. Still, pushing away people who want to use all available tools for writing correct python only hurts the community.