You still have to slog through GE5 every single week to keep it going. And if you get a new one every 4 weeks when doing GE5, and you get extra fragments like you stated, what's the sense of bothering with trying to make one last through 5 weeks? That's just extra work for nothing. But you do you.
Combining attack and defense boosts into one number just muddies the water. The Serpent is 15/15
after getting it to level 3, which is decent for its size, but not enough better than other buildings to do the work to get it. And the GRF is 7/7, but as
@Sharmon the Impaler pointed out, the regular Ritual Flame at level 2 is a 12 for defense. Much less work to get and pretty much a wash on the boost level. Not to mention that chain buildings limit your options when arranging your city.
LOL. Watchfires are useless, as are Tactician's Towers. These new GE5 buildings are, too, except
when doing GE5. I can't believe you all don't see the ridiculous hoops Inno has you going through to get buildings that only help
with the feature that provides them! Would you do GBG if you only got rewards that help do GBG? No. Would you do Cultural Settlements if they only gave rewards that helped with Cultural Settlements? No. So why do GE5 only to get rewards that help with GE5? It's madness, I tell you. Pure madness.