Slotted ALOHA and CSMA/CD [closed]

        I'm currently studying Networking via the top-down approach (<em>James F. Kurose, Keith W. Ross, Computer Networking, A top-down approach</em>).

3 Questions:

1. Why do we take the propagation time into account between nodes in a CSMA/CD network but not in an ALOHA network? It also leads to a different calculation of the goodput between them, as we have to account for the wasted contention slots in CSMA/CD. Why don’t we account for those possible (?) slots in ALOHA too?
2. I’ve read an answer about CSMA/CA/CD and their properties: https://networkengineering.stackexchange.com/a/42976/80812. That guy said there: "…however most modern 802.3 communication is full-duplex and as such does not use CSMA/CD…".
   It seems like he’s saying that CSMA/CD is not full-duplex. But why? We can both hear and talk in CSMA/CD, so isn’t it full-duplex?
3. I came across a question that I hope you can clarify for me:

Concrete question/Misunderstanding: I didn’t understand the answer. Why doesn’t it improve the goodput? We have at least one good thing that CSMA/CD provides us with and it’s the ability to sense the channel before transmitting, which might reduce possible collisions inside a slot in slotted-ALOHA. What am I missing?

Note: NP-CSMA stands for Non-persistent CSMA: https://www.tutorialspoint.com/non-persistent-csma-protocol.