Are these ‘risky install methods’ actually dangerous or just overblown?

I keep seeing people argue about certain “risky” installation approaches.

Some say they’re totally fine, others claim they can mess up your system or even lead to account/data issues.

So I tried digging around for actual cases where something went wrong — and honestly, I didn’t find much that looked convincing.

For context, I haven’t used anything like this myself.

So I’m curious:

Has anyone here actually had real problems because of this?
Not rumors — actual experiences with some kind of proof or clear explanation.

If there are real risks, I’d like to understand them properly.
If not, then maybe this whole topic is getting blown out of proportion.

Genuinely curious what people here think.

Side note: I used AI to help write this because I’m not a native English speaker — just wanted it to sound clear and avoid unnecessary comments about my English.