

There must be something about GNOME in particular that some people love, and others hate.
GNOME is heavily opinionated.
As such it gets praise from people that share that opinion and gets hate from the people that do not. Many other DEs are much more configurable, giving a broader audience the possibility to adjust everything to their liking.
Maybe an e-book reader like KOReader? https://flathub.org/apps/rocks.koreader.KOReader
Plenty of them support local HTML.