It’s easy to be fooled into thinking you can “fix it in the mix.” But that attitude should never get in the way of proper recording technique. It may not be pro studio clean, but it’s guaranteed to be leaps and bounds better than untreated room sound. A cheap DIY vocal booth can solve much of that problem.
Untreated rooms with a ton of natural reverb are keeping you from getting the best vocal sound you can. You guessed it: the biggest hindrance to a “center stage” vocal mix are poorly recorded vocals.