Zanzi the just 55
Master Corporal
Biggest problem with leaving some tech tree arms alone if not needed is that as you progress you end up using them to fulfill quest anyway. It seems that I'm always at the stage of ending an era when a new event shows up. With this event as early as the 2nd quest it requests building 3 new residentials. I'm in the modern era and am satisfied with those that I have. If the ones you already have were counted it wouldn't be so bad but to just burn some buildings to rebuild them is ridiculous so in my case, I stopped playing this event. The rewards are not really great anyway and I already have oodles of coin and product so don't need anymore. You have to make the events more worthwhile for those that are further along in the eras. For those that are in the early stages of the game any event is worthwhile for the rewards that they could attain but a 'happiness' building is probably not needed by those further along in the game. I know in my case I have so many decorations and buildings in reserve that will never be used unless I can build them and destroy to attain a reward. Just my 2 cents.Sorry guys... there's tons of dead ends in the tech tree and this is supposedly a game of strategy...
If you decide to research every single nook and cranny of the tech tree just because it's there then you shouldn't moan if there's nothing left to research except for the next age .... while I chomp my way through AF I still have InA, PE, and ME techs left to research on a minute's notice (all FPs in and goods in the kitty)