You shouldn't have your taint log running constantly.
Code:
/dump GetCVar("taintLog")
should return "0" in your normal everyday playing.
You only set taintLog to higher logging states temporarily to try solve a specific taint-related issue or to get logs to submit to an addon author to help them, then you turn it back off.
Taint is "normal", all user code is tainted, the problem comes when taint spreads to code paths for protected actions (parts of the default UI related to actions addons are prohibited from automating, like targeting / moving / casting and some others)
https://www.townlong-yak.com/taint.log/about.html gives a good overview.