It's built around the insistence on having just one taskbar, one dropdown menu per option, one line of text per profile, one Reich, one Fuhrer. This all probably sounded really good to some jargon-infested boardroom back in 2013 when things like material design were developed, and it sounds nice and accessible and mobile-friendly, but for the end user it's just extra work.
OG taleworlds had 3-4 layers of taskbar at the top but it meant you could get anywhere on the site in 2 clicks or less. Here you can't even click on a profile directly. I wouldn't be surprised if overall use of the forum goes down because of how hidden some things like unread replies and the ability to view new posts are.