well the floodgates opened, so here we go.
1 is complete garbage because the simple harnesses on a backplate work insanely well to conform to lady curves... without a chest strap the straps go outside of their chest, come down at the narrow part of their waist, and then fit whatever hip size they have. The crotch strap removes any possibility of the waist strap riding up on their hips, so no need to buy some special lady bcd
2 is also a load of garbage because you hang below the bc in most circumstances, and you don't need any extra padding because you're wearing a wetsuit most of the time. If you aren't, then yeah a backplate pad is nice, but certainly not necessary.
3. you NEED 3 drings for most all types of diving. you NEED 4 drings if you are using a dpv or are clipping stuff off *front crotch vs back crotch*. You need 5 d-rings if you're doing technical diving where you need the right shoulder for light clipping and primary regulator clipping, left hip/shoulder for SPG and stage bottles, front crotch for DPV, and rear crotch for things like reels and what not. You can put a 6th d-ring on the right hip if you put stage/deco bottles over on that side or want it for temporary storage. Anything more than 5/6 is completely unnecessary in any backmoutn circumstance. Sidemount will sometimes have 2 additional d-rings on the shoulders so you can have a low d-ring for cylinder attachment, and a normal height d-ring for everything else, but that is extenuating circumstances.
4. as mentioned is completely wrong and a function of people that don't know what they are doing loading too much weight on the belt, typically too far forward on the diver. If you are weighted properly, you can chill out at the surface with no problem.
5. isn't really a tip, just a generic statement. Yes, good divers should be able to dive any rig without any problems, however that doesn't fix the fact that a small woman diving a big steel tank in a 7mm wetsuit may not have enough lift in her jacket bc because the amount of lift they have is typically set by the size of the rig, or the big guy diving an al80 without a wetsuit with a 50+lb lift jacket bc.