Regarding 2: I don't think I've ever seen this, in what situation would you rather share a video then a description of the problem + your log files?
Regarding 3: Should be fine as along as the script itself isn't harmful. Which you can really only answer by reading the script. (And funnily enough, you'd find an answer to your first question inside this specific script…).
Hm… But different distros have different philosophies (not just) about updates. That's part of why people choose a specific distro.
Theres still plenty speaking against flatpak (larger sizes, problems with GTK/qt themes, and it's only meant for GUI applications - you still need a separate system for the kernel and lower-level/cli tools. And frankly, that makes flatpak unusable to me, because the purpose of a centralized package management system is not having duplicate systems).
So in short: y'all are gonna pry pacman from my cold, dead hand.
Sorry, but you're plain wrong on your first issue. Getting all your packages from one source is one of the biggest upsides of Linux.
Do you seriously think advertisers buy each user's data individually, and sometimes Google goes "oh hey guys just a heads up, that individual is using an ad blocker 👍🏼"?