FTR, I've been in pro audio doing live sound reinforcement since the late 1980s. I have never once in my career encountered a mono PA. They existed, of course, back in the 1970s and 1980s, but they are a thing of the distant past. All the warnings you've heard about using stereo live are mostly nonsense. Been there, done that, both behind the console, and on stage in a band with two stereo guitar rigs since when.
That being said, don't feel like you need to run stereo to sound better. Mono guitar rigs sound just fine through a stereo PA, too, and are certainly easier and cheaper to build and manage.
That being said, don't feel like you need to run stereo to sound better. Mono guitar rigs sound just fine through a stereo PA, too, and are certainly easier and cheaper to build and manage.