gsbhasin123 I use Zoom installed as a flatpak regularly, and you do not have to re-sign in each time. Occasionally on an update, but not usually.
I've had trouble with Zoom crashing after running for few minutes, but this happens no matter the package install method (flatpak or snap, not sure about tarball). It doesn't happen every time, but often. I've decided to stick with flatpak though. When I get the crash I find I need to do these steps:
sudo flatpak repair
sudo flatpak permission-reset us.zoom.Zoom
reboot
Super annoying...