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@adamhill A cultural failure to value the marginal user and engineer to their constraints. This leads teams to assume that their own computing situation (fast devices/networks/etc.) are a fine substitute for the business' users.

This has been growing ever-more-wrong as mobile devices proliferate, but PMs have not gotten wise to it yet. Some new metrics like INP are shining a light, and may cause a shift, but at this point we've grown a whole generation of "I've got mine, Jack"-ists