There are a lot of reasons to rewrite an existing system. Maybe the existing system is built in a language that is impossible to hire for in the area you’re in.

There are a lot of reasons to rewrite an existing system. Maybe the existing system is built in a language that is impossible to hire for in the area you’re in. Maybe the test coverage is awful and the code makes it very difficult to write tests. Your tone is frankly pretty condescending and the only reasonable answer to when it makes sense to do a rewrite is “it depends”.