There are upsides to using a CSS library such as Material, which applies best practices out front and doesn't require the use of the entire library. Often I find it to be the fault of designer/developer teams who find it easier to import an entire framework into an app when only 15% to 40% of it gets used.
I found that together with LitElement created web components I can choose specifically what I want to include as shared CSS across all components and adding only what I need keeping the components light while enjoying shadowDOM isolation and reusability. It's great to have options, but I'm very sensitive about just how many bytes we have to deliver to a screen.
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