In general, yes. Also it would be better for the environment, even if you want to avoid washing the ball up and use tea filters

Temporary note in terms of auto delete after a time? Although the manual Zettelkasten workflow intends you to delete your temporary notes by hand, it is pretty easy to automate this in Obsidian. Personally I have some actions for meeting minutes and notes on people to be moved to designated folders, but the same principle could be applied to create an action to delete any note older than X days

Well, Obsidian does have a bazillion plugins that make handling all kinds of content easier. I'm pretty satisfied with the out of the box experience though

I would recommend looking into personal knowledge management. I manage mine in Obsidian and treat snippets like permanent notes

It does! Basically any package is offeted. There's also a mobile app for Android and iPhone. Just take a look at obsidian.md

Obsidian has very rich support scripts and workflows documented for MacOS - I highly recommend it

Disclaimer : not an Apple user, not a lawyer

This should be illegal by European law. Without further knowledge it seems like a prime example for the GDPR letter of death and a pretty solid case for data protection lawyers