They aren't meaningless. Water boils at 95 C at your altitude - effectively the same temperature for all "common" usages. E.g. you'd still better not stick your

They aren't meaningless. Water boils at 95 C at your altitude - effectively the same temperature for all "common" usages. E.g. you'd still better not stick your hand into boiling water. A <5% error for the zone that >99% of humans inhabit seems pretty practical to me. The freezing point is effectively identical.