I attracted some Scorpios in the past, and have two of them very close in my life.
I think Scorpios love genuine persons. So, being yourself is a plus.
I love that they take you for who you are. You don't have to hide your true colors/ true self. They don't run away or reject your dark side or not-so-nice parts of you. I just love their acceptance of human nature and how they make you feel ok for being yourself.
They like to debate and discuss. They definitely appreciate it if you read and get informed on various topics.
They like to laugh, they are serious only in the beginning, once they get relaxed they can be very funny and playful.
They are very sensitive and need someone who reads their soul.
Also, someone who pays attention to details or someone observant like they are.
They don't care so much about the looks if one has them or not, they will love you for who you are and as you are!
Genuinity, authenticity, intelligence will attract them... but chemistry is a must, deep chemistry on multiple levels.
At least that's my experience with them 
I agree with everything you mentioned..
Also, I think with any sign, you should just be yourself. If you’re going by some sort of rule book, trying to attract someone based on their zodiac sign, you’re not really being authentic, and authenticity is important if you want an enduring relationship. If you naturally attract Scorpio, it shouldn’t be that hard to figure out what attracts them- it should come naturally. And I think Scorpio, being water, would be more likely than a lot of other signs to pick up on whether someone is being authentic or not, and very quickly. If you manage to contrive some sort of seduction tactic, you might get a lay, but you’re not really gonna have their heart. Best to keep things organic. That being said, there are things Scorpio is attracted to. But you either have it or you don’t - you can’t artificially induce it. Why would someone even want to do this? There are ultimately no benefits.
Ugh, I think people just get a boost by it, as Scorpio is about power. We’re talking about the sign that holds the most power. Don’t even get me started- that’s why everyone who knows their birth chart, and has some Scorpio placement/s, focuses in on their Scorpio placements at the cost of developing their whole chart/self. It’s a real shame. They don’t know it but they’re disempowering themselves!