Every spaghetti ball starts with these one liners. Using just one line implies no structure or separation of concerns (needed for anything complex), which is wh

Every spaghetti ball starts with these one liners. Using just one line implies no structure or separation of concerns (needed for anything complex), which is why nobody is talking about this case, and immediately jumping to theoretical "SPA-like functionality, but implemented in jQuery". EDIT: as for your original question ("significant amount of FE functionality"), from my experience jQuery loses a lot of its appeal when you have over 1k lines of JS, and I guess over 5k JS frameworks (React, Ng, Ember, Vue) start to be significantly better. When over 10k jQuery would be crazy mess (I have seen one such project, it was fun trainwreck).