Several years ago I worked on a monolithic website that used static files with no templating engine. The problem is they had so many contractors working on changes for specific ranges of content that there were a variety of ways that even a mundane meta tag with the same content value was written (is the tag self-closing, is the value placed before the property, are certain characters in the value encoded, etc.). Find & Replace can quickly end up becoming a bigger game of Trial & Error especially if there are no standards in place.