These two are not the same thing. Every app is allowed to serve you personalized ads, without asking. ATT is about cross app/site tracking between other companies, which is something Apple has never done.
monero, without dev tax and pre-mine, simply doesn't have the funds to compete in research with other, more well funded projects. I don't see how a different emission curve would have helped here.
MRL work is progressing on Seraphis[1] which will allow for significantly higher ring sizes without increasing the transaction size. A proof of concept is currently in development.
I have found AMP to be an awful experience. It messes with native scrolling physics, pages are often incomplete or straight up broken. It also disables Reader mode on iOS so I'm always forced to load the full web page anyway. Luckily iOS 15 web extensions have solved that problem.
The CLI does support Ledger but it uses the same monerod binary as the GUI.
Did you export your view key with Ledger? If you refuse it can cause hanging and crashes. With exported view key and the latest version there shouldn't be any of the issues you are describing.
The Wikipedia article is incorrect, Monero still uses ring signatures. Bulletproofs are used as efficient range proofs in RingCT to hide the amount in transactions.
The CSAM detection technical summary [1] only mentions iOS and iPadOS.
If it does come to macOS it will be part of Photos.app, as that's the only way to interact with iCloud Photos. I would recommend you to avoid that app and cloud in general if you care about privacy.