Why would any of the contents "blocked" from any players in ED by guilds?
It's the opposite: guilds could provide these contents to play with.
Of course you have to join a guild for that (or establish one) just like you have to open the tap if you want to get water or you have to put clothes up if you want to get dressed. Or you have to sit in a spaceship if you want to get out to the void in ED. And you have to switch the FSD on if you want to jump. And so on.
Just because you don't choose to be part of a guild you are not blocked from the content.
Or do you think you are blocked from flying a Conda because you chose not to grind credits?
Are you blocked from buying an A7 FSD just because you don't find it where to buy?
Guilds would not block a thing. (With how the instancing system performs even if they would like to block anything, they could not, LOL.)
Let this "guilds are blocking"-madness go.
The point of guilds is to provide some contents which are achievable by well organized cooperative gameplay. There are things you can not achieve alone (like building a A380 for example) - even a wing is not achievable alone. Or is it also blocked from me because this very evening I can't find anyone in my instance?
So please don't be scared, nor assume anything here like it was a necessity because you've seen that in other games. It's up to the coders to develop a system which takes care of itself (in which ED again does not shine, but anyway...)
Ah, I just got this in my mind: you are blocked from ED content right now: if you play on PC then you can not access to the X-Box universe and vice versa. Ooops. How many development hours have been "wasted" on this and we are blocked!
LoL.