What's always missing is nomacs - the best image viewing and light editing toolkit app on linux.
Nobody ever mentions it. Why is that? Why? It supports all the formats. It has the best slideshow options. The UI is as minimal or as informative as you set it to be. WHYYYYYY DOES NOBODY TALK ABOUT IT??? Who paid you to be silenced?
I used it for a long time years ago and it is indeed very great. But its only maintainer stopped around 2021/2022 because he got a new job or something along that line. As far i see he partially returned later but is still looking for more contributors. so the future of the project is not really secure. e.g. see https://github.com/nomacs/nomacs/issues/987
For some reason it's not included in Debian Bookworm (currently stable) and Bullseye. It previously was in Buster and will hopefully again be in Trixie (currently testing).