I don't know how badly you can misread what we wrote
Kalarion or if that's just the line you memorized back then and you keep repeating it endlessly. Because nobody is talking about joining "all ten guilds and become the Supreme Grandmaster Archmage Assassin Knight in one playthrough" or "I get to do what I want, when I want, without having to think about the character I created", which are lovely strawman arguments in the first place.
It's entirely possible to make a character in AoD that fails miserably in Teron. It's entirely possible to make a character that gets stuck later in the game through poor resource management, poor character building, and poor RNG (when it comes to combat). For example, until you get really good equipment, almost every fight has the possibility of killing you and you usually don't get to run away. Similarly, at some places you can only visit once and if you don't meet certain skill requirements, you're locked out of certain outcomes. You cannot know these things unless you metagame the game. Or you're someone obsessed with AoD to the point that you play through every route multiple times but then that's metagame knowledge of your own, sort of.
Again, that's not a GOOD thing or a BAD thing. It's just a THING. It's a design style just like the way it's possible to do absolutely everything with a single character in Skyrim is its polar opposite. The EXECUTION of that style can be poorly or well done but the style itself is just that. And for the AoD-style of gameplay design, metagaming is hugely useful. It's helpful in Fallout 1&2 to know where you're getting free skill-ups and free equipment, so you can grab those first just like it helps in Baldur's Gate to know where the ability increasing tomes and the best gear is. But the games are executed in such a manner that they are forgiving to the player who doesn't know it. Can you play AoD blind? Sure you can. Does metagaming help? Most definitely.