so how do u surf the web basically?
browsers can be considered as the most advanced sandboxes, even if there are vulners all around the “digi-verse”… i think this engine is actually very neat, and its open source and widely used. security is a thing for the devs, just as well as for the users (both hosts and end users).
for sure, they could make in theory a js free pure html forum engine, but i, as a m.facebook.com user on my notebook, can clearly confirm u, that its not such a pleasure to use it!
btw, are u a developer? java applets and flash stuffs are closed source and have different toolset behind them with different abilities, i dunno about java security risks, but flash was fundamentally a security hole and when this was discovered, the world moved accordingly. the world relies upon js actually, js is everywhere, even in ur phone and desktop apps, like its part of the gnome display engine.
otoh here u go for any better ideas: https://source.puri.sm/ - ur free to do it better, but actually if they would work on a neat forum engine in the name of the “dont trust nobody” slogan, they would reach no much, while u can see how much busy hands and interests met at the git of the current engine.
and i really hope that u didnt get me wrong, cuz it was no offense, but they provided a forum for us, and working hard on a world wide unique leet mobile platform instead of reinventin the wheel, they are carrying actually a really huge responsibility for a better world.
btw i guess u could be a power user while not a developer, and hype/creep driven media planted some inaccurate beliefs inside u, if this is the case, then please dont creep the ppl around. there is a chance that there is a vulnerability in the engine, probably with less comfort there could be less space for such vulnerabilities, so somewhere ur clearly right, but the best measurement for the security is the most audit a thing just got, even if a strong competitor is the minimalism. otoh, i believe that we can be sure that its not a privacy nightmare, cut such antifeatures are not welcome in general and if anyone can see such issue then will rise their voice against it, and in the world of open source ppl have power to take away control if the actual control misbehaves.
all the bests for u, i really hope i wasnt impolite with anything!