Intentional, sure. But more on the lines of "allowing a shared architect role introduces extra UI and backend complication and doesn't give that much more benefit to group projects so it's not worth developing that functionality" rather than "architects are all supposed to construct their systems solo but we can't be bothered to implement an actual ban on cooperation".No. This isn't to be waved off as a mild inconvenience. It is a core design element of the Colonization update. Please review This Marketing Page for Colonization. This absolutely implies repeatedly that the individual player takes on the role of System Architect and given the agency to create a colony. It is absolutely an intended core idea.
Why, though? At the moment it's (subject to bugs) automatic and instant. Usually the complaints about ED features is when they require extra manual steps that don't obviously do anything.Edit: That other players can assist - yes. But absolutely. But nothing coming close to sharing System Architect roles. And IMO activating a new facility is definitly a System Architect role.
I can't imagine in a situation in which someone actually would do this, but if someone would find my half-done Asteroid Base really useful to them if it was finished off, I can't see what either of us has to gain in the scenario where they haul the remaining 25,000t of cargo, but the base doesn't finish building / activate services until I get around to logging in and noticing this has happened.