Did you even played in that time to say something like that? People still attacked moons, and bigger players attacking weaker ones still had much to watch out for, because a very possible ninja could occur. And FYI weaker players did in fact attack bigger ones successfully. They just had to know where to look.
And yes, the activity was changed, but much of the implementations on Ogame goes without players opinion.
So you know, back then, first no activity was showed on moons at all. Then they changed it that no activity was showed at all on planets and moons, you only got it by spy report, and later they changed so that when you were online every planet and moon had activity, this later was the fleeters golden age as it was just plain easy to know if the target was online or not, no activity offline, activity online. And then it was changed into what we have now.
I have no quarrel with you BubbleBeam, but it just hurts when people say it does not work, when in fact it did very well and those that were here in that time know it. Today much of that panache is lost, people do spy & fly attacks and don't even look for signs of activity and get crashed. People no longer know the strategy that involves in ogame.
About the planet fields, you're wrong. You think just because it suits your play style that it's fine for everyone else. A medium miners account, with 35 Metal, 30 Crystal, 30 Deut, 10 Shipyard, 10 Robot, 4 Nanite, 16 Research, 10/8/7 storages, 4 Missile, with NO Solar Plants, and it's already 164 fields. Hardly an accomplishment, and still more than your 140 fields minimum. And unless you want to get stuck later on with a planet that you can't no longer build anything you'll find yourself in a bad position. Do remember that the Homeworld gets 167 fields, and the possibility to leave it was one of the good decisions GF made, because even 167 is just plain bad, even if it suits your playstyle.