For example beating the boss at the end required the use of the eye scanner to see the weakness and the auto-target machine gun you pick up along the way... what if you're missing one of those components? Will you just repeatedly die unless you load an old save file and replay up to 30 minutes of gameplay?
I'm guessing that the fight will just be harder without those components. The auto-targeting weapon appears to simply be a gun that can bend bullets from around cover, so there shouldn't be any reason why you couldn't use a different gun that simply shoots straight. You'd just be a little more exposed. As for the eye scanner, I hope that it simply
reveals the weak points, rather than
creates them. Ideally, even if you go into that boss fight without the scanner, or just never use it, you
should still be able to destroy the tank, either with a stray shot, by noticing it (without the benefit of it being highlighted) or by going online and learning that you should shoot it. If just takes knowledge to beat him that way, then you wouldn't need to load an old save game.
On top of that, the scan of Royce indicates that he has 3 weak points and shows what his resistances are, including a low resistance to electricity. The gamer appeared to exploit only one weak point and didn't use electricity, so one would presume that there are multiple ways to kill him and we saw only one of them. I sure hope so because I hate when bosses have a single way or "trick" to beat them.
I never take devs at face value when they make non-specific claims, but they seemed to imply in the video that the fight started because the player went to see the MiliTech agent, and that if the player didn't they might have been able to buy the bot without violence.
We know that using the Militech agent's money to buy the bot is why the sale went badly in that instance, but I don't think that we can infer from that that it's possible to buy the bot without violence. What we saw was the result of taking a non-violent path, after all, and it led to a boss fight, which suggests that the developers might want us to experience that boss fight, regardless. Even if we skip the MiliTech agent and go straight to Royce with our own money to buy the bot, the game might find a different way for the sale to go badly, leading to the boss fight. We just don't know.