I have recently played 3 games that have forced a lengthy, unskippable tutorial section that runs for several hours of the game, just to unlock the most basic functions like buying the items, customizing features, multiplayer, and even 2-player split screen modes.
For 2 of these games (Armored Core 6 and Gran Turismo 7), the major draw for me was the MP and I haven't even gotten to check out MP yet because it's locked out until you get passed a certain point in the progression system. Fuckin' why do any developers do this? I just wanted to play with my sister but we have to get through most of the fucking game before we are allowed to do the multiplayer modes. Such bullshit.
In ac6 it's about the inventory and not the gameplay. Before the multiplayer unlocks you simply don't have enough stuff to go online to fight.
Yes, it would be nice if they had some kind of fixed inventory multiplayer mode, but the main game is about getting stuff and early on you don't really have enough for a decent fight.