The first 80286-based system (IBM PC AT), 80386 (Compaq Deskpro 386), and 80486 all had people writing about their suitability as servers, with the consensus's implication being that normal people didn't need them.

The Pentium is the first one, I think, that this didn't happen, because by then it turned out that people need a computer that can do what they are currently doing—but faster—much more often than they need servers.