Maybe I'm silly but I don't understand why you wouldn't do web interactivity with old machines by going the old-fashioned way, which if optimized can feel wonde

Maybe I'm silly but I don't understand why you wouldn't do web interactivity with old machines by going the old-fashioned way, which if optimized can feel wonderfully fast (just not as fast as an SPA that anticipates data loads, giving the user the illusion of instant) and will be more lightweight, easier to understand, will take advantage of all the old traditional tech ecosystem, etc. If we're talking about people who haven't upgraded their browsers in a very long time... chances are that light vanilla websites offer the best experience.