Is BG3 allowing me to play the way I want?

Yes and No.

I was super excited about this game. I wasn't even going to buy it, because of the Mature rating and there was mention of sex scenes and basically content that I don't approve of. Whenever a game has such ratings, I hesitate. Is the content a must to play the game, or is it just available as an option.

In this regard, BG3 has hit the mark. It is a game that has the content available, but it is an option that I don't have to trigger, for the most part. (The comments of the duergar and a few others at points gets disgusting and raunchy, and I wish I could turn them off, especially because they repeat their comments a lot over and over and over again. I'm sick of hearing about someone choking on Nere's prick.)

Anyway, aside from that, I was SUPER excited about Turn-Based D&D 5e video game because every freaking D&D game since the old Pool of Radiance games have been RtwP, and I was UBER looking forward to a true D&D 5e interpretation into a video game especially because previous versions have always been so Feat-heavy and complex. I wanted no character scripts and no automated minions, full control over my party, etc.

Again, I got this... sorta. I got a D&D 5e-ish Turn-Based game with monsters that look like 5e monsters but don't exactly act like 5e monsters. And as discussed at great length, there are many mechanics that aren't 5e. Though I don't mind some minor tweaks to the rules and monsters in order to fit into a video game - or just because it makes the game better - the homebrew really ruins a lot of other elements for me and makes the game unbalanced. I won't go into details so as not to derail the thread. Enough's been said elsewhere.

But a big part of it is that I really want this to be a genuine Forgotten Realms story and setting with immersion and cohesive and intelligent characters and companions. I want to FEEL like I'm really in the Forgotten Realms world, and I want to NOT have to pretend that I'm just a naive fool MC and that my companions are NOT terrible liars and obviously evil. In many ways, they've done this, but in others they have fallen horribly short.

And I REALLY want companion growth and development to be something I can do simply by traveling with them, not because I slept frequently so I could trigger special dialogues. I want to be able to build relationships up with said companions based on what really matters to them as opposed to dialogue events that shouldn't affect the companions as much. (Lae'zel should like me more for completing her quest to get to the gith patrol, and if I do a few things in between that she maybe doesn't like as much, the amount of relationship points for doing her quest far exceeds the minor conversation choices I made on situations she really couldn't care less about - like saving Sazza in the tiefling prison.)