If OBSD feels it can make use of older arches then so be it, many users will find less intensive jobs for the respective hardware and it saves it from going to waste/recycling.
Not to mention plenty of people in the "developed" world (let alone "developing") can't afford to buy a new computer, and thus are going to use 32-bit "legacy" desktops and laptops for a very long time.
Unfortunately those sorts of people tend to be less informed about I.T and that eventually leads to their NetBurst, Pentium M and Atom machines performing even slower than they would be if they were maintained probably. They probably waste more power waiting for the machines to accomplish their tasks in an under-maintained state.
