That's the difference between good guild and a bad guild.
If your guild have well developed players which generates 4-6k guild goods per day, can fight far beyond 100 attrition, willing to log in whenever it's necessary and have a lot of diamonds than of course you should absolutely demolish your competition.
The only change this rework did was increase the amount of goods to build support structures, increase the cost of diamonds to finish them and significantly lower amount of fights for the most active players.
So the diffence between strong and weak diamond guilds is even more visible as you have higher costs to cover and all the heavy lifting can no be done by several individuals.
I think you're bang on the money. Our round is pretty much the same as before, 2 big guilds dominating, 3rd guild doing what they can but just can't compete as member participation must be low, the rest chipping away when they can, but they have low membership numbers so even with max attrition they blow out pretty quick, may take a couple of 4th tiers sectors.
The biggest difference for the big 2 guilds is it's now slow and boring, its changed from Blitzkrieg to trench warfare.
If i can feedback from internal discussions of a guild of 80 active players, you've sucked the fun out of it for us. We can cope with costs, attrition cap is fine across the guild, just adds frustration when someone wants to play on their lunch break but attrition climbs too quick or if someone does have a lot of time to play, they can't, as you can spend a days attrition in no time, sectors are being taken but at a snails pace, it's just a slog. i can see why elephant racing never took off!!
If any of the developers do actually read this thread, get Space age space hub done ASAP! New GbG in SAT is doubly painful.