What’s an example that you’re thinking of? I think this can make sense - I mean if you have a town of 5,000 people and a government office there or something you probably don’t need a big, giant, building (unless that’s the message you’re trying to send). It’s also impractical from a cost-standpoint.
Federal buildings though should have gravitas and signify importance. If they don’t, and/or we think the government isn’t important, I’ll take my tax dollars back, thank you very much.
You can liken this to how western countries are leaving Christianity. Who can believe in God when you drive a Jeep to your mega church next to Costco and everyone is wearing sweatpants? (I’m not particularly spiritual but I see the problems here)
In Europe, Protestant churches are generally built much more humble than Catholic ones, because they are built with different philosophies in mind. (I am not familiar with American churches, so no comments there)
Similarly, I prefer government buildings to go for a similar route. It doesn’t mean that buildings have to ugly or small. But similar to Protestant churches it can humble, functional and elegant at the same time.