IMO upbadging makes a car look juvenile (see every V6 Mopar with a Hellacat badge or every "Cobra" ecoboost/V6 mustang).I think de-badging a car makes it look like a 16-year-old drives it. I'd say faux pas for sure. Kinda like wearing skinny jeans when you're 40.
My other car is debadged. The rear is incredibly clean looking, which I find much nicer. When it goes by most ppl don't know what it is & it definitely is a nice conversation starter with ppl that enjoy talking cars. Badges were only made to upsell model/trims levels...I personally don't find any joy in being free rolling publicity. I'd rather someone that is genuinely interested ask & I'm happy to continue talking about the driving experience, the engine/trans swap, etc with them.