The most push back we get against making the language or compiler stricter is not for this reason though, it is mostly that the maintenance burden for existing code is considered to high.

But this illustrates how absurd the discussion is nowadays. Incrementally making things stricter and fixing warnings along the way is one of the most cost efficient way to improve quality and safety. Rewriting the software one of the most expensive. So if the former is rejected because the burden is too high, then obviously the overall aim to make things safer can not be too important and the push for rewrites must partially be motivated by other interests.