Is the use flag gstreamer recommend for a KDE desktop?

[nagmat84]

I am using a pure KDE environment and I have disabled any GTK/Gnome related stuff as far as possible. My profile is amd64/23.0/desktop/plasma/systemd. Years ago (probably a decade), I explicitly enabled the use flags gstreamer and ffmpeg on a global level. (Don't ask me why, probably, because some Gentoo Wiki recommended it back then.) My chosen profile does not enable GStreamer by default.

For some time now, whenever I try to upgrade my installation via "emerge --update @world", I get a warning that some updates have been skipped due to dependency conflicts. FFmpeg is held back at version 4 due to some indirect dependency related to GStreamer. More recently, GStreamer has also been dropped as a backend for Phonon, see https://bugs.gentoo.org/935033.

Hence, I am wondering, whether I should disable the use flag gstreamer as I am under the impression that GStreamer is only a reminisce of the past. However, I am also wondering what I would I if I did so. Currently, the following installed packages use gstreamer:

• app-office/libreoffice-7.6.7.2:0
  
• dev-qt/qtmultimedia-5.15.14:5/5.15
  
• media-libs/libcanberra-0.30-r7:0
  
• media-libs/opencv-4.8.1-r2:0/4.8.1
  
• media-video/pipewire-1.0.7:0/0.4
  
• media-video/vlc-3.0.20-r11:0/5-9
  
• net-misc/freerdp-3.4.0-r11:3

What functionality would I loose without GStreamer (if any)?

The packages

• dev-qt/qtmultimedia
  
• media-video/pipewire
  
• media-video/vlc
  
• net-misc/freerdp

all have ffmpeg as a use flag as well. Hence, I assume those package would simply use FFMpeg if GStreamer wasn't available?

An interesting package seems to be app-office/libreoffice. It has the use flag gstreamer but nothing else which looks like an alternative. I read that Libre Office cannot embed video/audio into presentations without GStreamer support. Is that correct?