Level 3 in the S-Class and EQS has been available since may 2022. And the speed limit is there because that is part of a UN regulation that the Mercedes is certified for. The regulation has been updated since the release of Mercedes Drive Pilot to allow speeds up to 140km/h but Mercedes needs to recertify for that.

The most fun you can have on the Internet is correcting people who are wrong. So, today was a good and fun day. Thanks. ;)

Aluminium is typically used as is though

That would result in some shitty products. Aluminium is also mostly used as alloy, pure aluminium is pretty soft.

https://en.m.wikipedia.org/wiki/Aluminium_alloy