I understand what you mean. However, have you ever thought that life still comes from the living beings on Coruscant? It is a huge city; and while I'll admit it is lacking in plants where there needs to be, humans/aliens/and everything in between are in the hundreds of millions! That is probably enough life Force to sustain the Jedi's love for living things.
Enough, for sure. But just "enough" isn't good enough for the central hub of a religion. It should be "the most" - a concentration of everything they hold dear. What about the design of the Jedi Temple has anything to do with what they believe in? It looks cool and impressive, but it's got nothing to do with the Jedi religion. And why all the steel? From the outside, the building looks like a Fabergé factory. It blends right into the industrial/commercial opulance that makes Coruscant such a spectacular - and dehumanizing - place. Sure, the city's filled with lots and lots and LOTS of people. So is Grand Central Station. Can you imagine a Jedi relishing in his love of life by standing in a train station?
I understand the desire for a central meeting place - someplace close to the halls of political power. But why not make that place a respite from the chaos around it? If I ran the zoo, my inspiration for the Temple would be the Hanging Gardens of Babylon. It doesn't need to be a messy, uncultivated swamp like Dagobah. A place low to the ground, but spread over many miles, full of gardens and orchards and strange animals and children chasing each other around while doing spectacular stunts in the trees. A place where the buildings are crafted by loving and talented hands, not by machines - pinnacles of art and of patience. Perhaps, a place where the concentrated energy of the Force is so great that rocks float in the lake, and flowers grow out of thin air. And my mind is really wandering there - I'm sure there are totally different directions you could take this idea, but the point is that it's not hard to envision a temple that is both spectacular and centrally located, and that still exemplifies the Jedi ideals. Yet Lucas didn't bother. He didn't think.
And, for the record, my opinion is that he thought very little through, and that it had a very huge effect. People slam his directing all the time, and it sure wasn't great, but the real problem is the story itself. The writing. Stupid little things that contradict and didn't occur to him, and add up to hurt the films at all the critical points. Stuff like Queen Amidala is "young and naive," but it turns out she was elected, so the whole young-monarch-inherits-huge-responsibility concept has the rug pulled right out from under it. Stuff like building a protocol droid to help his poverty-stricken mother. With what? Dinner parties? How is it that he fits perfectly into a mass-produced shell? Did Anakin buy the do-it-yourself kit? He should have built R2-D2. For one thing, Artoo is unique. For another, Artoo is plucky and resourceful and heroic - and could therefore be considered the embodiment of his good traits, even during the rebellion. The only thing Threepio seems to have inherited is his whininess.
And there. RIGHT THERE. That's the big one. Anakin is a brat. There is no level on which that was a good decision, and it's not just Hayden's performance - he was written that way. And it spoils everything it touches. This is supposed to be a tragedy, but a tragedy only works when you sympathize with the main character. It's tragic because you can see how that person's flaws led to their downfall, and because you realize how likely it is that you would have done the same. You can hate Michael Corleone, but all the moreso because you know how good he could have been, and because you understand why he made every choice he did. I don't understand any of the choices Anakin made. I don't sympathize with him, I don't relate to him, and I find him annoying and idiotic. He was characterized very badly and very inconsistently. That alone, even if everything else was perfect, destroys the entire trilogy. That character arc is the entire reason the movies were made in the first place. If that arc works, then everything else is forgivable, and if it doesn't, then nothing else matters.... and Lucas botched it. Badly.