Not boring. Your description of the workaday buildings is consistent with what I see at my friend’s LDS church. Admirably workaday - a hum of activity, mostly family centered, also faith centered, and church-service and community service-centered. A fine thing to behold. The strong fellowship* there reminds me of what I miss most about my Evangelical church.
So, you are saying the Temples are rich in symbology, with every part of the building having a theological meaning (vs. a purely practical one)… But the local churches which are consistent in their unusual and unique style across time and space, have NO meaning at all for their unique, unusual and consistent architecture except purely practical and non-religious ones. (Including to meet building codes of California?) Even though no one else has ever recognized this unique and unusual style and copied it for their church, for its “obvious” practical design. This doesn’t match up and leaves me feeling again there is certainly a theological/ideological reason.
But as I already alluded to in a previous post, I think I have the reason. I think its along the lines of the reason why the Kingdom Halls design their buildings like they do, which I just happened to include images of when I was trying to demonstrate what I meant by particularly unusual architectural styles. Must have been my guardian angel showing me the answer to my own question.

I am hoping that a Mormon here would verify my theory but its apparently not something that is taught at the local church level.
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http://myagape4u.com/images/monstrance-sm.jpg
Religio, you would be interested in this, its about that fine fellowship: I was telling a favorite priest how I miss that fellowship and he said, "They have* to have fellowship - they have to have
something. Look at what they
don’t have." That’s the Real Presence, of course. Worth giving up lovely fellowship for.
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http://d1kn32quvsf7z3.cloudfront.net/images/G_bdayJunePearl.png
The Catholic Church: The Pearl of Great Price.