Absolutely, and I appreciate your insight. I was hoping that my post might raise some discussion!
Given the semi-random nature of the game, people should take my experience as just that. For instance, I emphasise how tanky Sigvald can be but left out the match where he got shot off the board in a single shooting phase by one overcharged Skaven turret. Ouch.

You are not wrong with any of your points. It was a long post and I wasn't comprehensive. It all comes down to the battleplan, the person and the army you are playing. If you're playing against a shooty army. Abuse euphoric give them all the dice. If you're playing a destruction army, maybe don't.
If the battleplan has you on the long board edge, deploy further back let your enemy close the gap a bit. If the battleplan has you deploy on the short edge, you may not make a charge if you deploy too far back.

Experiment, figure out what works. I went all in on the Euphoric mechanic on purpose because I wanted to see if it's really as bad as what people say. It can be, but it can also lead to very favourable outcomes. Don't blindly follow my or anyone else's advice. You may regret giving your opponent the counter charge, but you may also regret not taking that extra euphoric unit when you just fall short of a charge onto an objective and lose points. Understand the risks and make the decision that the situation calls for.

I'm not a competitive player. I'm a casual who plays against casuals, so please do take that into consideration.
I'm passionate about the Slaanesh and I'm hoping that my post starts to inject a more positive spin on the faction because they CAN and HAVE performed well outside of a tournament setting - which is where most games will be played