We'll address this in pieces as someone who's finishing up as someone who's playing a 10 CHA ranger/rogue with a roommate who's a 5e DND veteran since day 1 and playing a high CHA/Persuasion lore bard. If anyone reads this guy's comment ignore it because it's factually incorrect.
1. Is CHA the most useful out of combat stat? Yes and no. This depends entirely on your gameplay and what you want out of the game. Keep in mind that high CHA isn't necessarily even the best conversational path and is never the only path. A high CHA just gives you a higher chance to succeed a conversational check which creates a different story path. However, if you're interested in playing something like a rogue there's a good chance you aren't even interested in that path and will take a more underhanded or investigative path toward conversations. My friend and I have both had VERY different outcomes in certain situations and interactions the other didn't, and in no cases was it game ruining or bad or any such. There are some sitautions like the end of Act2 where a check is critical but you can easily save scum the 2 or 3 HIGHLY game altering ones that exist in the ENTIRE game. Don't let people tell you you'll have a reduced experience as the result of failed checks because the people high in CHA are going to struggle on things like sleight of hand 30+ checks which exist and lead to some REALLY cool stuff and interactions. Larian put stuff in here for everybody. And even beyond that, I've entirely avoided complete fiascos due to things like my stealth which created nightmares and headaches for him. Different' stats, different playstyle, different experiences.
2. He implies you literally won't succeed any. We can assume he means figuratively but even that's laughable. With permanent guidance you'll pass the vast majority of them, especially with inspiration being abundant giving constant advantage. There will be a few impossible or near impossible ones and you'll definitely miss some, but that's the nature of tabletop and don't let it discourage you. Again, you'll get to do things those high CHA characters won't have access to (like certain rogue and ranger only interactions which CHA heavy classes don't see and boy some of them are good).
tl'dr the OP is wrong in stating this as a community blanket fight. The only part of his comment which is accurate are where he says "I do not plan on failing every [charisma] roll" and "can also be the single most useful combat stat for you as well". These 2 phrases in his diatribe are the only ones you should pay attention to as they capture tabletop RPG's in their entirety: what's best is only what's best in YOUR situation. If you're a ranger/rogue who's playing with sneakiness and cunning in mind, charisma is a terrible stat and his advice will lead you to hate your game and character and result in an INCREDIBLY unfun experience. Do what seems fun to you and if it's not quite what you expected, use the 100 gold reroll to try a different style till you find one which matches. You aren't locked in to your initial mindset ever.
