And he is completely right. This is among my won biggest criticisms towards people advocating for horizontal progress. It simply doesn't work nowadays. You can certainly borrow elements, but people are always going to min/max whenever competition is involved. Yes, some will stick to a preferred build no matter how inferior. They also won't be allowed into any serious party. FFXI suffers that backlash immensely when certain jobs combinations were deemed "trash" by the community. The result? If you played them, you weren't getting into parties. The same would happen in XIV.
People will follows popular youtubers. Do you not think MrHappy, Xeno and Mizzteq will all produce content on good skill tree builds? Once they do, why wouldn't you follow their advice unless you've found something even better? Experimentation only works when there isn't a means of determining a definitive best. It wouldn't just be the top players demanding builds, but the entire endgame scene. Case in point, healers who won't DPS are almost universally ignored or expected to solo heal. Only during prog do you find some groups running two healers with 0 DPS. And like I noted above, FFXI implemented a similar system. It only led to people being left out of parties because their selected job combination wasn't good.
