This reminds me of the question "Why has no one made a better Board Game Geek?" (https://boardgamegeek.com/). It actually is slowly getting better now, but it is still shockingly stuck with a UI/UX from the very early 2000s.

Another website, Board Game Atlas (https://www.boardgameatlas.com/) was launched a year or two ago to compete with Board Game Geek but hasn't really caught on, despite having a superior UI/UX and some killer features.

Why has it not caught on? Mainly because everyone is already using Board Game Geek. That is where the community is so unless everyone moves over en masse it probably isn't going to happen.

However! After Board Game Atlas was launched, Board Game Geek suddenly started updating their UI/UX.

Here you can see the pre-Board Game Atlas homepage:

https://boardgamegeek.com/dashboard

Here you can see the post-Board Game Atlas homepage:

https://boardgamegeek.com/

They've made similar improvements for interior pages. Up until very recently the interior pages were totally unusable on mobile (the forums are still terrible), but now they are mostly usable.

My take away is this, if you want Goodreads to have good UI/UX, create a competing website that does the same thing as Goodreads with good UI/UX. When Goodreads feels threatened by the new site, even if people are not moving over to it en masse, they will start to find the time and money to fix their own UI/UX problems. Though, it may take awhile, BGG has been improving, but it is taking a long long long time. A shockingly long time.