I mean that’s the way they set up the site and are running it. The Discourse team can make as many new inventions as you want, you have a grand total of 0 input on if any of it is ever used in whatever website you may use. Your first challenge would be to make them even care what you, one user wants in regards to redesigning their site. Then they’d have to install it, make options available, etc. all of which have the underlying assumption that they even think it’s an issue in the first place.
But either way you’ll have infinitely more luck (I’ll wager .5% more?) by telling the people on the actual site you find their site impossible to use and poorly designed, instead of trying to get the people who made the software to make brand new software that you can do literally nothing with lol. All the flaws you mentioned are solely because of how they wanted to set up and use the site. Adding new functionality to “fix” a problem that was self created doesn’t make much sense