I'd say there's absolutely no shortage of PC players who walk into Coil with the mindset of "pew pew die" - that's not a console issue, that's a people issue.
Regardless, on the topic of this thread, I am in absolute agreement. One should never assume players will consult forums or watch videos before doing content. One should not even assume that players even understand that the option to do so is out there. One should always be ready to discuss mechanics and help new or inexperienced players to learn what they need to do.
However, I also believe that if, after asking whether anyone needs advice or assistance, you are met with silence, it is safe to assume everyone is confident and ready. Instances where players have made it all the way to level 50 without coming up with SOME form of communication with other players may happen, but are exceedingly rare - and encouraging them to continue to be uncommunicative is doing them no favors at all. This is a social game; players need to learn to communciate sooner or later, and the sooner the better. If a silent player begins to get frustrated because no one will tell them what to do, that's a GOOD thing, because it will encourage them to speak up, ask questions, and learn.
This is true even for players who do not speak a common language; auto-translate is there for a reason, and it is more versatile than you might think, as any veteran of FFXI can tell you. On that game, ALL servers had players from all regions; there were no data centers like we have in FFXIV. Practically a whole form of speech was born from interactions between cultures; there were few players of any language, for instance, that did not know that (Fishing) meant to seek out a mob, pull it, and drag it back to camp, in spite of the fact that the term was added to represent, well, catching fish. While a similar sub-language may not be present in FFXIV, there's still plenty of information you can get across with auto-translate.
There's no reason to always assume the lowest common denominator when deciding on a playstyle. If one is present, adjust accordingly, but until then play however you like.