POLL | Open world. Yes or No? Then, how?

Yes to the open world setting, no to how it was implemented. You plunk down a colony, and it's fully built after a cutscene. That's totally not realistic. It should start out small, and necessitate you coming back later to see it built up some more. The map should noticeably change, each time you come back after some time has passed. Missed opportunity after the Kett base is destroyed on Eos, for example, for Initiative forces to be picking it apart for tech and intel, or attempts to be made to recover/salvage the first two sites. Prodromos doesn't visibly grow since you initially plunk it down, and it's like that for every colony.

How they handled viability is also kinda dumb. It shouldn't be a static value that you reach and that's it. It should drop over time (and never reach 100% until just short of endgame), with new objectives to complete that simply weren't available before, and not simply walled-off by insurmountable waist height fences/radiation hazards. Reaching 100% viability should be an indication that you're literally done with the map, and have zero reason to ever go back there.