Yes, but that was awhile ago that they said it as well.
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The steam deck does benefit from common hardware. Valve will distribute prerendered shaders for the Deck's GPU over steam game updates, so most of the time deck users don't have to deal with shader stutter or wait for the game the render them itself during first startup.
Steam may share shaders between linux users with the same GPU, but I'm not sure. A new steam machine will definitely benefit from this though.