My Revival in 40k! Need some things clarified

Hey guys! So last time I played Dark Eldar was back in 5th edition and I used to run mostly just warriors and trueborns, 2 ravagers (1 for AI, 1 for AT) and a few scourges. HQ would usually be an Archon and a retinue of Inucbi to accompany him. Heavy on shooty. I've been noticing a lot of lists here using a succubus instead of an Archon (though I keep reading Wyches are bad) and still the same usual warrior + raider combo, but a lot more scourges, venoms, and some other stuff. Also, it's hard to not notice the vast amount of Wracks, Grotesques, and Haemonculi popping up on lists all over the place!

All I want to know is are those last ones I mentioned now pretty much a must-have in non-shooty-heavy lists? Also, Archon vs Succubus? I'm sort of lost as to how DE are right now but I'm assuming the general strategy couldnt've changed TOO much!

If you used to use your Archon as a beatstick, the Succubus is the preferred choice, as her glaive gives AP2, the archon has no AP2 options.
Unfortunately, she can't take the Shadowfield, so only gets 4++, but doesn't lose it if it shorts out.

Wyches DO suck (Boo, my favourite unit in the fluff!)

All the coven stuff got better this codex, especially if you get the Coven expansion. Grots in particular are awesome now; I preferred them as my Archon retinue in 5th, they are even better now, so my Succubus is happy!

How are scourges doing?

Very well - a points reduction and options for 4 weapons in 5 man squads means they are very efficient in an AT role

You could still use Wyches to tarpit something that can't overwatch very well, doesn't have many attacks in close combat, is not a vehicle, and somehow still worth tarpitting. But there aren't many units that fit this description.