I remember a few Jeep SRT folks putting on aftermarket exhausts to the tune of $1400+, and only gaining 7 HP or less (dyno confirmed). As you said, most "performance" mods now-a-days are just for the looks/sound or so you can make it feel more of your own. Even the guys that claim 1-2 MPG gains with the Ram Air Flow will take a long time to make back the $800+ cost. I'm still considering this mod myself, for the looks mostly.
The larger throttle bottle won't hurt anything, but I've done it to three or four vehicles now... a 5.9L V8 in a 2001 Ram 1500, a 2014 Grand Cherokee with the 5.7, and my 2014 Ram 1500 with the 5.7 that I traded in for my current 2020. Even paired with a Volant (2001 Ram) or a S&B (2014 Ram), didn't help much. 2001 Ram even got a little better exhaust before the TB, and that helped more than a larger TB.
Do what you guys want, its your money, and it shouldn't hurt anything other than the wallet. Just don't expect huge gains without getting deeper into the motor and doing a custom computer tune, which also hurts reliability depending on how extreme you go.