Yes I use alot of stuff from other Distro's repos like Linux Mint, MX Linux etc. I was a former Arch User but I got lazy to maintain the system. I decided to just use something easier since I don't have bunch of time to fool around anymore. My exams are coming and I need to not have pakages to just break while I have online classes.
I think app images perform better than flat/snap sometimes. The bad thing is tht it doesn't integrate as well because I think it doesn't auto update
Me too I also don't like the idea of an appimage, what if you build an application from source will it be faster?
That's an option. I build stuff from source as well, when I can't find a proper .deb file.
To have barebone of building stuff you install;
sudo apt install build-essential
App images are standalone - so they do not autoupdate.
Generally, they start up faster than a Snap Package does. Appimages are not sandboxed the way Snap Packages are.
Does building an application from source allow it to be managed by application manager like apt?
No, only if you build a .deb package for it in the process.
Interesting, can appimages access system theme, system fonts, custom fonts, .etc?
Thats kinda sad, I like my applications managed by one application manager. I don't like the idea of having multiple managers to install and maintain a specific software
It may depend on the appimage, but the ones I have been using all do. For example, Deadbeef does.
Synaptic Package Manager. 
sudo apt install synaptic
Oh I heard of 'synaptic' before I remember using it on Linux Mint(I think it's preinstalled). This may help because Zorin Application I find it slow and buggy, Idk your experience may vary I guess. Imma try it out and see what it does.
Zorin OS defaults to the Ubuntu Software Store, which I personally find too minimalistic and buggy. It is more like the Windows Store, which is why Zorin OS uses it.
But I switched to Synaptic within a few weeks of starting out and never looked back.
Yes it's too buggy even the Windows Store is probably better because searching for something doesn't take a whole minute. Zorin Team maybe should make or use another GUI software manager
Exactly the reason I left also. It is hard to beat the stability of Debian based distros 
There are tonnes of Debian based servers but not much of Arch based servers for a good reason.
Each distro has it's ups and downs I guess
There is no "perfect" solution for everyone.
One should find the distro which best suites one's need.
Not many of us has a capability of my Gentoo wiz friend who can pick and chose packages himself and create his own distro 
Bruh I don't like Gentoo because it takes way too long to just install stuff
I think several hours to install Firefox. Not very practical for most of us.
Yes I know, I tried the speed of the application and it's not even that much more responsive. Pick your poison I guess