Right on. This is related to "the big rewrite" that kills a lot of projects. Time and usage makes code value go up. Even if it’s written in an old framework that you wouldn’t use today, uses urllib instead of requests. Just ignore the urge and move on (for now).

I’ve recently worked on an old project (www.oath.is), dusted it and launched it as an app. It was a Django project and my urge was to rewrite the whole thing so I could use SQLAlchemy and Flask which I had picked up in the meantime. On the frontend I immediately wanted to rewrite everything in CoffeeScript and Backbone.js. But I resisted it and managed to spend my time adding features, a new design and unit tests and launched in like a week. After launching I had some extra time to rewrite the jQuery-spagetthi, which paved the way for some more advanced client side features without becoming a horrible mess. So I guess you have to make that decision multiple times over the lifetime of a project. But yes, holding off the urge is a good practise.