Karl-WE well done summarizing, and you only scratched the surface. Let's throw into this exposure-athon, Windows vs Microsoft and Defender vs Security, and related to these, the loose use of (or not use of) "Guard".
Next look at all the overlapping iterations of *** Information Protection. As if moving into data classification wasn't a challenge to begin with, now there is picking between 3 starting places and migrating between them as it is slowly figured out internally which product will win the long race.
Them there is *** Advanced Threat Protection.
When you go and look at the product plan comparison pages for M365, O365, EMS, AIP, AAD, Windows 10, you start to find mysteries even there. Not even internally is it all memorized second nature by anyone.
Final area of gripe, and the one that stirs up my anxiety the most - studying for exams. It's a nightmare to study for some exams. The "official" practice tests are unable to keep up, yet still cost a lot and there is simply no resolution other than studying with bad information and being on your A game so you can know when the "answers" are right or wrong.
I'm at least happy there are feedback hooks in just about every interface these days, so I can harp into them to keep my head from exploding.