This may surprise you, but we used to make web pages without JS. I know, it's a shocker!!! But guess what? 1 is irrelevant, 2 is irrelevant, 3 is there by default, 4 is easily solved, and so is 5. Turns out, logic on just the server side is simpler. It may not be as pretty, but please don't assume that your way is the only way.
When were you building web pages without JS? 1994?
Server side logic MAY be simpler in SOME cases. Overall applications have become a lot more complex over the last 20 years and your oddated methodologies have been replaced by tested thorough solutions built and used by some of the biggest companies in the world.
Well, admittedly, I don't write webapps that often, as that's not actually my job. But last one I wrote without JS is also the last one I wrote period, about 2 months ago. Must be completely ramshackle and useless. Too bad it functions perfectly for me... Again, please don't assume that your way is the only way.
