> I get your point but at that point why not just rap from webbing?
I often rappel from just webbing, especially if I think nobody is likely to do the rappel again before the webbing turns to dust.
I use a ring if I think the rap anchor may be somewhat frequently used.
For example, if I'm pretty sure I will use it again in the next few years.
Many sling/ring anchors have 2 rings these days.
That's OK, but not really needed given their strength.