Dr. Kaiser provided a great service with TFF and Classilla, but it was inevitable that the development of the internet would outpace him, and fast. I am of the strong believe that rather than trying to get the modern Web directly onto vintage machines, we should rather focus on either doing it through proxy devices (which yes, essentially just makes you browse the 'net on a modern device through the vintage Mac, but going on the modern web with a vintage machine is generally a novelty anyways), or even better: Creating our own websites with value for retro users that do work with vintage machines, through simple HTML and minimal CSS and JS if necessary.
We're already seeing services like Macintosh Garden, System 7 Today and 68k.news fit this goal. Rather than decrying the spiritual "death" of our old machines, let's put in that effort and create our own webspaces, just like back in the days. Because that's truly what using these old machines is for, reliving computing days of the past.