Actually, stats do increase automatically upon level up as I understand it, presumably keeping a basic ratio based on class, so you won't level without stat improvement just because you didn't choose a passive. Passivs and gear provide further boosts and allow you to customize them after that. I'm not sure why you'd think crafting was the only way to get the items you want. Maybe the only sure way, but that's a far stretch from necessary.
I'm not so sure about that. All we have to possibly support this is an ambiguous tweet that may or not confirm that or just mean we increase attributes via purchasing passives at level up and equipment as well, which also can be level locked. What we do have is evidence that would seem to support there not being any kind of auto-allocation at level up with two characters at the same level in the same class, but with wildly different attributes. Screens showcasing this are in the OP.
You cant expect the store you have the items with specific attributes you want, if you do want specific attributes then yes crafting is mandatory.
Sure, but that could be as simple as just enchanting an item you already have with a couple attribute boosting runes. Same as in the last two games, that's not exactly the same as crafting a whole new piece of armor or weapon.