I don't think that 5KB sites should be a standard, some pages just needs pictures or JS to give the experience the users needs. But a developer should always know what he is doing: If all you want to do is a show/hide toggle, then don't include a full blown JS library.
The difference currently is primarily the design, and how you structure projects. We were avid Trello users in the past, but our Trello boards always expanded to way too many columns, which made it a mess scrolling horizontally.
With Wiplo, projects can have multiple boards (which often represent stages of your workflow), and each board is fixed to four columns, so no stage of your workflow grows too large and cumbersome. You never have to scroll horizontally, and can jump from board to board easily.
A video would quickly show the benefit of this and how nice it is to navigate, but we're still wrapping up the edits on our video.