those softwares are released with their own installer ( davinci resolve for example )

perfect

there is a store for them called appimage pool which is written in flutter and its also an appimage itself. https://appimage.github.io/AppImagePool/

yes appimages are good but my problem with them is that when there is a new version i should download them again and again…

yes flatpaks are great but their only downside is the download size of an application

aur is limited to arch based distros only

but what about the apps that are not in the official repository?

for example tuba the mastodon client

no they just decided to make 4.0 into 40