it isn't JUST a RWD vehicle. It is either 2wd or 4wd. It is actually recommended to launch in 4wd. So no...it isn't going to "twist in half". You aren't pissing anyone off. Don't worry. You just don't really know what you are talking about in this instance.
If it was a ford he'd be swinging from your nuts so hard that you'd have bruises on your thighs, he just like's to hate on anything that isn't a ford, lol.
People don't know shit about these k2 vehicles 14-18 gm truck suvs meaning ron36. The rear axles are a 12b 9 5/8 ring gear. Shit ain't gonna break. As for the 8l90e trans you have. The only thing you can really do to them right now is billet internals and a higher stall. Which I wouldn't do until it breaks. I'l give it to gm for these vehicles. They did a great job making everything bigger unlike the older models.
Drive it like you stole it till it breaks. Then fix what breaks. But until then. Enjoy it