I'm on Pentium 4 dual-core cpu, it has two ports for both headphone and microphone. There are two jacks present both in front and back. When I use pulseaudio jack port from back of the I/O only works, front one does not work. I resolved this issue by removing pulseaudio and installing apulse. Audio from both jacks (Front and Back) works perfectly.

When I'm using software installed by Appimages, audio works great. Flatpaks expect me to have pulseaudio but I don't have it but I'm using apulse (pulseaudio emulation for ALSA) because I want my audio jack to work.
Can I resolve this issue with flatpaks?

Both formats cannot detect detect my system theme. I'm using adwaita-qt with qgnomeplatform package which provides adwaita theme on QT apps. Only natively installed applications pickup the theme. I have previously compiled FreeCAD from SBo looks great natively. The AppImage version looks alien to me and horrible.

I have removed all appimages and flatpaks. I was being lazy on compiling from SBo. Everything is set up now, I have replaced all others not in SBo, by installing rpms by using rpm2tgz.

As Slackware 15.0 gets older will rpms in future stop working with rpm2tgz? Have you ever encounterd this with 14.x or older series? (15.0 is my first Slack install).


Lastly, Should I care about universal formats in future? Youtube Gurus are promoting them as future. It has too many issues and sometimes it freezes my entire session, making me do forced reboot.

Future or not, so long as free software licenses are still around, you won't have to use universal packaging formats if you don't want to. There's no need to keep banging your head against a wall if better alternatives exist.

In any case, not every YouTube personality is an expert, and none of them are fortune tellers.

You missed pipewire. Probably that will be used instead of (or next to) alsa/pulse in the future.