Perspective is important :) Putting 1000 material design inputs on a page isn't something a sane web app would do. The same is true for a native app.

Re. "bloat" of components. I think it's important to remember everything something like paper-input is doing for _you_. As a developer, I no longer have to think about: validation, animations, a11y, keyboard, knowing all the MD spec configurations, labels, underlines, colors, fonts, typography, margins, composability, x-browser interop,... Sure, if you were implementing your own input, you could cut corners and/or leave out what you didn't need. However, if you were creating a highly reusable, highly configurable element, you'd be implementing the same amount of "bloat" yourself.