If we're talking a government site, chances are you don't have the budget to be able to hire much above junior or midlevel devs. And the project manager probably has a small budget [^1] and little experience with what the web design choices really mean (and what the trade off are).

I think you'd be surprised who ends up making those decisions.

Which goes back to the original point (that's valid for any project) - keep your user in mind. If your users will be using recent-ish iOS or Android devices, use as much flair as you'd like. If your users will be using mass-market low-end devices or used devices from 4+ years ago, then maybe dial down the interface.

Knowing your user is important, no matter what level you're at.

[1] Unless we're talking about some kind of large system that's being redesigned by a consulting company on a cost-plus contract. Who knows how those decisions are made.

I am always baffled by people who blame developers. Like some mid dev or junior would calling shots what stack should be used for project.

Preach! Amen! Hallelujah!