[wisty]

Bad old code has been battle tested. Bad new code has not, and is more likely to have the show stopper bugs you want to avoid.

[seleniumbase]

There's actually a lot of examples being used for testing (https://github.com/seleniumbase/SeleniumBase/tree/master/exa...), which are run regularly (locally and in GitHub Actions). Plus, a lot of major companies are using SeleniumBase: https://github.com/seleniumbase/SeleniumBase/blob/master/hel... (if something breaks, I find out quickly)