Okay, I didn't say to evaluate my city.
I just built that tree to satisfy a quest to build a decoration (no age requirements), so I built the cheapest one. Then I got interrupted and wasn't able to delete it right away. So, no, I haven't had that tree this whole time. That's the problem with taking a random snapshot of a city.
I started this thread because I'm about to do a purge and reorg of my city and want to make sure I am taking everything into account when deciding which event buildings to place and which not to place. So, this snapshop is *before* my reorg -- the city isn't optimized. That's kinda the point.
And, yes, I was short on population recently, so I had to stick in something to get some more people.
Also, this is my first city. You seem to expect everyone to know about the game from day 1. I prefer to learn it myself, so I don't go on the forums much. Not to mention that every time I do, I get a lot of noise for signal and have gotten bad advice here in the past.
Finally, a lot of things people do involve having higher age friends, which I lack. My guild didn't have any arcs until recently, and we've all been getting them and leveling them. It takes time, and it takes knowing people get an arc in the first place.