I have to say, you're not looking at the 1x war and 30% DF objectively. When you played OGame in the early 2000's it made sense, because you could go the majority of a day without being able to login to OGame.
You will never be able to catch anyone active on this server. I just simmed in-system flight time for a cruiser with impuls 16, and it takes 23 minutes for it to reach the target, and if the server is gonna be filled with heavy defence just sending the fastest ships isen't feasible.
Why build a fleet if it was a miner server
OP is trying to make an argument that there would be reasons for building fleets in this exact server, so debating wether or not someone would do it is reasonable I'd say.
I get your wishes OP, I really do, I get nostalgic about old days of OGame too where servers were filled with players and you really had to spend a long time building an account. However I think OGame would be stone dead, had it never evovled into faster gameplay, the playerbase just isent there.